|It's only a motherboard, but yes, it's a good one.|
You'll need to match up ALL your components if you wanna build a gaming rig. Besides the board & CPU, you'll need a decent gaming video card, 4GB DDR2-1066 RAM & a high quality power supply. About $500 +/- should cover it.
We can't tell you which CPU to get because there are too many choices - dual core, triple core, quad core, Athlon, Phenom, Phenom II, Toliman, Kuma, Callisto, etc. And we have no idea of your budget. Let us know how much you're willing to spend for a CPU & list the rest of your system specs.