Computer Q

[Wyrm]

2x XFX Core Edition GS250XYSL4 GeForce GTS 250 512MB 256-bit DDR3 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card - ~$220

At that price point, I'd rather have a single 5850 card. Or, if you're devoted to nvidia, a gtx 465. Any specific reason you want the 250 instead of something newer? Seems a bit odd that you're pricing out an i7 and leaving the gpu so lacking.

is this thing powerful enough for today's games, such as Call of Duty Black Ops, Star Craft, or (most importantly) the upcoming Diablo 3?

No, no, doubtful but possible. You can change those answers to sort of, kinda, and yes if you plan on running at 1280x1024 with the graphics turned down. The 5450 is more of a "home theater with casual gaming" card than a gaming card.