Yeah, I agree with Blackhearted. My little GeForce 240GT 1gig runs pretty well for everything, including Blender's Cycles, so a 6gig card is REALLY throwing your money out the window. The 6 and 8 core procs work pretty well these days - Most of the Intel procs have multithreading and work really well. I'd go with building two really good machines: after all, you can use them both to render at the same time, as Blackhearted has pointed out.

Laurie