That all looks pretty good there, one thing to consider again is how soon you plan to use CAD, as saving 100-200 dollars would be a good investment towards a really nice card, and by that time, hardware prices will have propped. On that specific series of card, the 9600 with 1gb of memory, apparently it has some problems right now, so i might steer clear of it until they get figure out. Something like this is a pretty good alternative Newegg.com - EVGA 512-P3-N860-TR GeForce 9600 GT 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Desktop Graphics / Video Cards
I wouldn't really worry to much about availible video memory as you are going to have a lot of ram to cover whatever is needed.

Originally Posted by megamaced "Welcome to another of Swansen's random thoughts. Guaranteed to confuse the best of us, or your money back!"