Either of the two systems you posted would probably do the job just fine, the biggest issue is going to be the video card, if you have been doing any SW stuff on the machiens you have now, anything you get will be a million times better, the video cards going to be the biggest pain in the balls in making sure its goign to work and render correctly.
I’m with singh, if you can spring the money I’d say get the workstation card for peace of mind…
Now’s the time to buy a system too prices be dropping lately