If it's any consolation, I absolutely love mine. I have my cables running up the back of my 900 so they are not in the way. Return it if you must, but know you are in possession of a kick-ass product.
I've done several builds and the ones I've done with modular PSUs are not that much more cleaner than the ones without. It does depend somewhat on how many components are going in the system and how much space is behind the mobo tray to hide wires.
Microcenter is great about returns, i doubt they would give you any issues. I'd like to warn you about the low amperage on the Antec 1000W 12V rails. I've always prefered having a single large rail. I'd say keep the one you got over the antec 1000W truepower.
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