CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor............$209.99 (Amazon)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard............$124.98 (OutletPC)
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OR
CPU: AMD FX-8320 3.5GHz 8-Core Processor...........$139.99 (Amazon)
Motherboard: Asus M5A99FX PRO R2.0 ATX AM3+ Motherboard.............$126.98 (SuperBiiz)
Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler...........$29.98 (OutletPC)
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You could swap the board out for a sabertooth, but that will hit your max budget
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