The benchmark is useless... Even at release I ran the game ok on SLI GTS8800s, I play with SLI'd GTX470's now and I'm sure you could get away with a cheap 550 or 560 or ATI equivilant on a budget. Obviously in the long term you're better off buying the best GPU you can afford, likely something in the $350+ range
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FFXI:Sylph - Perrin 75 Hume THF; Retired (At least from my use any way)
EVE Online:ScraperX; Retired
WAR:IronClaw- Peryn SW;SkullThrone- Grymloc BO; Retired