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For this build I'm going with a power supply that I've used many times and that I trust to deliver solid, reliable performance -- the CORSAIR Enthusiast Series TX750 V2 750W. This offers 750W of power, and a wide range of connectors. On top of that, it's quiet and is 80 PLUS efficient so it won't cost too much to run.
CORSAIR Enthusiast Series TX750 V2 750W.
Apple packs a 1TB drive into the Mac Pro. I think that we can do much better. The 3TB Western Digital Caviar Green WD30EZRX will do nicely.