Best CPU for Asus p5gc-mx1333?

I'm already building a gaming desktop with the 270x and what not, so this is asides from that fact.
But I have an older PC with the asus p5gc-mx 1333 motherboard, 2gb DDR2, and an LGA775 socket. I'm getting an old GTX 260 2gb tomorrow for 40$, so figured I'd throw it in there, and pair with a somewhat decent processor. But I'm not familiar with this MB or the socket type. So what's the best CPU I can get for this motherboard? I was thinking an Intel Core E8600. This isn't any specific PC, but it would be cool to have a spare my buddies could play Minecraft with me on or something:b

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