Videocard

i know someone who has a gtx 280 and it can run call of duty 4 on highest settings and he gets upto 450fps, dont forget tho its not always about the graphics card, ensure you got a decent cpu & maybe some high speed ram 2gb 800mhz+ (however this is if you intend of gaming alot and playing some demanding 3d games) if not save yourself some money and go with the 260.

Also tbh if you plan on hooking the pc upto the tv with resolutions of 1900 × 1200 then maybe the 275 would be a gd idea. At low resolutions it wont make much diffrence, exept the price.