I can give you way more specifics then you would probably need (wall of text warning):
First and foremost I’m going to assume you’re like me and that you’re server / PC is not next to your TV(s)… that being said if you’re streaming video content you’re seriously going to want to do it over a WIRED network. Wireless can only handle so much throughput and you’ll find that it’ll get annoying for most any HD content - you need the bandwidth.
Now to address this: most server / media extender (settop boxes) are able to interface over cat-5/6/ethernet/etc… so all you really need is a home router at least, assuming you have enough ports. If you don’t have enough ports you should be able to pickup a switch for cheap and put it in after the router… we’ll address that if You NEED it. Otherwise plug the server & the STB into the router and call it done.
Far as serving up your media: I was a big drobo fan, but it’s very lacking as it’s basically a minimal managment NAS… what you really want (for the same price range) is an actual media server - Similar to what you posted. However I fully believe you’re better of with a full computer / whitebox for a number of reason, more control / more expandability / not tied to proprietary shit / more future proofable / $ for $ better performance most of the time / etc)… This sounds daunting but there is alot of options available that require just abit of effort to setup. To be honest the effort required is about that of setting up a new PC in general (install OS, update a couple of drivers, set basic settings / interfaces).
So for $5-700 you can build a solid media server that will allow you a ton of expandability. You don’t need alot of computing power but you will spend money on storage space (depending on how much you want) instead. I’ll go ahead and spec out an idea for you after a bit of a primer.
With a media server you’re going to want to run raid 5 as it’s the best of both worlds for quick access and reliability in the event of eventual hdd failure. Minimal downtime, and very easy setup.
You will want to run Windows Home Server - IBHate. You would not believe how good of a product WHS actually is… I say this because I didn’t believe until I was recommended it by many people that I believed. I had a legit key for free so I gave it a whirl. It’s basically a Windows 2003 O/S but geared toward consumer media serving. It is incredibly full featured (very little setup compared to alot of other solutions) and streamlined towards setting up media sharing / streaming, AS well as auto backups. Its got very little overhead (especially for a windows OS) and alot of really nice user interfaces. If you google around you’ll find alot of good testimonials, tips, etc.
This (plus the to be named hardware) will serve any PC or windows compatible extender that you have in the home, UPTO 5 devices (IIRC) maximum.
As far as a media extender / settop box solution that is all encompassing yet not a full blown HTPC (home theater PC) you’re going to want the hottest thing going: WDTV Live HD Media Player.
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136499
Cliffs on WDTVHD: Handles every file format you’re going to throw at it, and it does so with a very user friendly interface as well as a pretty simple setup.
Its relatively new in the market but had developed a HUGE support base of users who love it. Relatively cheap; very easy to use; handles most all media formats; insofar its rock steady reliable.
Okay as far as your server hardware, you don’t need alot of computing power because you don’t have to transcode any of the media (very CPU intensive), nor is your hardware doing a whole lot of math processes. Keep in mind though that this is a purpose built machine whereas: You wouldn’t take a tractor trailer around Watkins Glen track. So it’s not gonna be your primary PC, it “could” be (you can surf the web, run MS Office etc), but thats really not the intent. So:
You have ~1TB now, I’ll guess that you wan’t 2TB (usable).
WD “Green” Drives are low power consumption but more importantly “low heat” drives - remember that your two biggest enemies are Heat & Power spikes.
Three of these (in Raid 5) will give you 2TB usable.
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136317
You don’t need alot of computing features so this combo will do you fine for infrastructure:
Mobo (onboard video): http://www.newegg.com/Product/Product.aspx?Item=N82E16813130234
CPU: http://www.newegg.com/Product/Product.aspx?Item=N82E16819116075
Fan / heatsink: http://www.newegg.com/Product/Product.aspx?Item=N82E16835118003
Free clip: http://www.newegg.com/Product/Product.aspx?Item=N82E16835118045
Ram (2GB is plenty): http://www.newegg.com/Product/Product.aspx?Item=N82E16820231085
Raid Controller (allows you to run hardware raid which is better then software raid generally, also give you 4 more sata ports to run more hdds as wanted / needed): http://www.newegg.com/Product/Product.aspx?Item=N82E16816124027
Sata cables (to hookup 3 hdds & 1 Odd): http://www.newegg.com/Product/Product.aspx?Item=N82E16812226004
Flash card reader (WELL worth the price): http://www.newegg.com/Product/Product.aspx?Item=N82E16820223103
Blue Ray / DVD drive (not burner) to read / rip movies: http://www.newegg.com/Product/Product.aspx?Item=N82E16827106325
Case (that allows upto 6 hdds, and seems to have nice cooling design): http://www.newegg.com/Product/Product.aspx?Item=N82E16811119161
Power supply (remember heat & power spikes are what kill components so get a decent power supply -also- this one has (6) sata power cables): http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=4236686&csid=ITD&body=MAIN#detailspecs
Grand total as spec’d: $632.36 on newegg and $74.21 from tigerdirect (power supply). Then add $100 per WDTV box.
This setup will do everything you want & much more. It will support any 775 Intel CPU (allowing you to upgrade when bigger/badder ones get cheaper); it supports the maximum ram you can run with a 32bit OS (4gb); and you’ll have room for two more expansion cards as needed. Oh, it’ll also allow you to run upto 6 HDDs (assuming you stick to 1tb each thats 5tb usable) so you’ll have plenty of room to grow / future proof.
I think thats enough info for now (I’ve spent way too long on this post lol), if you’d like anymore PM me, I’m not on here often.
Again, just my experience & opinion.
edit - sorry, I usually throw in an OS harddrive to run programs off of, then use the raid exclusively for storage. You won’t need alot, so something like this will do for another $35. http://www.newegg.com/Product/Product.aspx?Item=N82E16822148231
And if you want to (depending on your TV service) you can add a Tuner card for ~$100 that’ll record upto two inputs (over the air HD [2,4,7,29]), and clearQam (think time warner service from the plug without a converter STB) cable. All natively supported by Windows Home Server Media player etc.