jester uk... there are plenty of sites you can upgrade cheaply. i had 3-way sli gtx 9800+ 512s running and it would run sh5 on all settings on high except anti-aliasing was turned of but it would still stutter a bit in the command room. also if you need the latest drivers go to
www.nvidia.com or
www.geforce.com . if you go to
www.evga.com and click on products, then on B-stock you will find preety good cards at a decent price from $40 to $360 bucks

. Check out these other sites you could surf....
www.amazon.com
www.newegg.com
www.tigerdirect.com
www.ebay.com
.... and if all else fails.... google it.