I definitely don't want to spend above $400 on graphics, as it seems overkill given that I'm not such a huge gamer. Beside flight simulation all I normally play are 2d stuff like Cave Story and the like. The main reason I was looking at the 640 was that it seemed to be the only single-slot card worth a mention, but looking at the results, I guess nowadays you don't get decent power out of anything smaller than a truck. And since the price difference between an acceptable card and a crappy card seems insignificant compared to the price of the computer, I might as well go with an acceptable one. ...BTW, it seems that a used GTX 580 with 1.5GB costs exactly the same as a new GTX 660 Ti with 2GB. According to benchmarks, they are identical... Then, from what I gather, the 580 has four times the clock speed, and quarter the cores of the 660 Ti...