What processor are you planning on running? Just from a features and price perspective considering your usage I would opt for the sabertooth. It's a solid reliable board just as the ROG board but the $35 difference in price could fund more ram or more cores if you don't have a cpu. The boards are $185 shipped for sabertooth vs $220 shipped crosshair at newegg right now.
Praetor» i7 990X 3101A239
» Asus Rampage III Black Edition
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» 6GB Corsair Dominator GT TR3X6G1866C7GTF
» Corsiar Force Series 180GB
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Defiant» G74SX » 16GB ram » Corsiar Force Series 180GB » 750GB Seagate » Blu-ray