All of that totals: $340. That leaves $260 for the CPU and mobo. That means the i5-750 is out of range. In that case, I would go with the Phenom II X4 955 and Gigabyte GA-MA790GPT-UD3H for $256 after rebate.
If Windows 7 is not needed, either of those combos would be good. To be honest, I'm not seeing much of a difference, so get the cheaper one.