Sure thing. I'll get it done for you. Overclocking is simply running your CPU at max and making the performance increase by 'x' amount. It's really simple, at start-up a window will prompt asking you to press 'x' to open the BIOS. There you simply say 'Yes' or 'No' to overclocking. You won't need to buy a new MOBO if you're sensible.
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@darkangel1 Here's what I came up with: Intel Core i5-3570K, EVGA GeForce GTX 670, Cooler Master Silencio 550 (Black) - System Build - ************ I chose the top i5 (i5 3570k) because it's more suited to your budget and it runs on all games perfectly (I previously owned one). Personally I don't see the point in a CPU cooler, I've been managing to run 32gb ram, gtx-670 sli and an i7 without a CPU cooler. Will you be buying an OS? I left it out to show what I think is the best. If you don't agree with anything or want something tinkering just say and I'll see what I can do. ^_^