Hi all, was hoping to get some help with my decision to upgrade my video card.

I currently have a BFG 8800 GTS SLI enabled i bought about 2 years ago. Was great at the time, but is a little dated now. So I was wondering, I can't find a place where I can buy this old card new anymore, but should I buy one from ebay for around $50 and take advantage of the SLI thing? Or would it be better to spend a little more money and just buy a single card to replace the one i have? Was thinking of buying this one:

http://cgi.ebay.com/Nvidia-GeForce-8800-GTS-OC-BFG-Tech-512MB_W0QQitemZ330355132473QQcmdZViewItemQQptZPCC_Video_TV_Cards?hash=item4ceab34839&_trksid=p3286.c0.m14

Thanks for any help.