Looks alright, but i would make a few changes. Don't go for the guaranteed clock Q6600s. Basically all G0s are going to run at at least 3.3GHz, and there isn't a way to make sure that they will run at a certain clock unless you overclock them to test. Why go for a TB drive, then 2 500GB drives on top? There is no point at all. Change the power supply to a Corsair T750, or a HX620 if you want something modular. Finally, how big is your display? You might not need Crossfire in the future if you have a pretty small display. Generally, I would only recommend going with a multi-card setup if you ahve a 30 inch monitor, and very rarely, a 24/27. You may as well just upgrade to a new card. So, drop the motherboard to an Asus P5Q Pro. Also, go with the Asus sound card, as the others have said. The Xonar cards are all excellent.