You might want to look at the FIRST PART of the this thread..... where a few of us hardware geeks briefly discussed video cards for Melika's new machine.

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2829452

Essentially, Vue does not use the graphics chip to construct a render. Instead, the CPU is used. (This is true for most 3d programs.) So, for Vue (and for most 3d applications) there is little point is using a video card with more than 512 MB of RAM, and no particular point in using multiple video cards in SLI mode.

NVidia cards perform much better with Vue than do ATI cards.

I have installed Vue on a friend's gaming machine that is using two nVidia 540 cards in SLI mode. There seems to be no problem with Vue operations on this rig - it's just that there is no gain of any sort with the SLI dual cards. So, if the reason that you are interested in SLI is for the gaming facility, go ahead and do it.

If you are mostly interested in Vue, however, your money is better spent on a great motherboard, more RAM, and the best CPU you can afford.