So you got a total of $254 - $20mir. If thats all you needed I would probably grab a Sunbeam core contact heatsink and fan or maybe upgrade the cpu to e7300 but the e5200 is a great deal.
So you would have ~$580 - $65mir. Maybe grab a couple 120mm fans for the case. If your comfortable with $600 after rebate then you could jump up to a 4870 but its a big price jump.