I am cheap and work on machines that are home made. These currently are based on the Intel Q6600 and an SLi MB and dual video card configuration. My last system had an HD rendertest (from the VASST website) of 120 seconds, stock, no tweeks. The record seemed to be 88 seconds (I think) with a dual quad core system close to what you have spec’d. It seemed that that last 20% of render time costs 150 – 200% of the machines I’ve been building. These machines are based on the XFX 680i SLi MB, with 2 gig of SLi certified DDR2 Memory, dual SLi nVidia 256 GT7300 graphic cards, three monitors (2 are 19″ LCD monitors 1280×1024, and the third is a 22″ LCD HDTV (1280 x 768) with a DVI in, among many other inputs))They are running XPPro and Vegas Pro 8. I use the onboard 5.1 audio into a cheap but good sounding 6 pc speaker system. I spent $1675 for this system and exept for some possibly legitimate arguments about accurate color representation for certain high end markets, I got great value for the money. Plus any single monitor 3D or compositing app. can use the SLi video mode to gain twice the apparent video memory and dual video processor response. It would look to me like the better deal for you would be to get two cheaper systems for similar money. That way you can multitask more readily as one machine would probably be available when the other is tied up with a render.
IMHO
GB-)
“Better, Faster, Cheaper … Pick Two!”
Gary R. Brown, SCVE
Video Systems Engineer
Portsmouth Public Schools
Portsmouth, Virginia
23704-2135