Desktop Computer ( what to get?)

If I were you I would make sure you get the new I7 processors… They blow everything out of the water and fix a lot of the traditional bottlenecks in the Intel Architecture. Here is Dell’s offering for the I7’s: http://www.dell.com/content/products/productdetails.aspx/desktop-xps-730x?c=us&cs=19&l=en&s=dhs

In the new architecture RAM speed and FSB go out the Window. I personally hate Raptors, if you need i/o performance put your OS in a RAID 0+1 and be done with it.