Well, I bet you that a 3000+ won't overclock any better than a 2800+ anyways. I wouldn't waste the time personally. I have a 2600+ mobile and it's at 2315 right now, I'd go higher but I have a stock T-Bird 1000Mhz cooler. I think your graphics card would be a good idea to upgrade if you really want to use the system to play games, as a 3000+ would just be a waste of money. I reccommend a 6600GT if you want a $100-$140 card (depending on where you look, Newegg, Zipzoomfly). Or a 6800GS for around $240, I wouldn't spend the money on a 7800GS, because if you upgrade your whole system you can get a 7900GT for the same price with nearly double the performance.