I use my computer with a 1440x900 monitor. Are Sandy Bridge IGPs sufficient enough to play Battlefield Bad Company 2 at low settings (native res)? Call of Duty Black Ops? Starcraft 2?
starcraft2 *might* be playable... around 1024x768 Low Quality, a 2600k with a HD3000 will score about 34 fps.
Now since 1440x900 res is somewhat larger a res than 1024x768,... well.. do you consider around the ~20fps area range, playable?
Badcompany 2 and Call of Duty Black Ops are most likely more demanding than starcraft2, which is a more cpu bound game. So again... below 20 fps is probably to be expected.
You *could* try and wait for the Llano, its IGP is going to be about 2-3x times as fast as that of the sandybridge current IGP.
Or buy a small dedicated card, to go with the CPU you bought.