I currently have a E6750 overclocked with a simple Arctic Freezer 7 Pro cooler that is under $30 to 3.4ghz. You should also consider a motherboard upgrade before a processor upgrade. I would recommend a crossfire Gigabyte board with the P45 chipset ($135). If you really want to go quad then go with the Q9550 ($220) and overclock it. The huge cache of this processor is what is going to help your gaming performance. I hope this helps.