Your entire budget is $200 or just the CPU? Cause if it's just the CPU, here's one of the best overclockers under $200.
http://www.newegg.com/Product/Produc...82E16819115036
http://www.newegg.com/Product/Produc...82E16819115056
http://www.newegg.com/Product/Produc...82E16819115037
I italic the one that's the best for overclocking. It's 1066mhz for the FSB instead of 1333, like the e8400. If you overclock the FSB from the stock 266 to 333, you'd get 3.33ghz, which is basically the e8600, but for less and 3mb cache lower.