Yes - that Q6600 will be much happier in that ASUS P5Q SE P45 motherboard.
Im a little concerned that the Q6600 OC'd and the 4870 OC'd will push the Antec EA500 a little too hard. The Q6600 can suck a lot of power when OC'ing.
How about the OCZ GameXStream 600W? It's only $10 more but has free shipping so the amount charged on your credit card should be about the same. And it does have a $30 rebate.
The NewEgg site says it has 2 6pin PCI-e connector but the OCZ website says it has 1 6pin and 1 6+2pin (8pin) connectors.
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