You could spend less on the hard drive and get a Samsung Spinpoint F3 1 TB for $75. The SATA 6 Gb/s on the WD1002FAEX isn't worth the extra $, as the only mechanical drives that may fully use SATA 3 Gb/s are WD Velociraptors, and only in very short bursts.
For $5 more, you could get this G.Skill ECO series 4 GB kit that has faster timings (CAS 7), uses even lower voltage, and runs at a faster clock speed.
I don't know anything about the Hyper TX3, I do know that the Hyper 212+ is still $30 at Amazon, and it's generally well-regarded.
Finally, unless you already have a 32-bit license, I'd really recommend going with Win 7 64-bit. By going with a 32-bit OS, you'll only be able to use 3-3.5 GB of the 4 GB you've paid for.
Everything on your list will definitely work together. I assume, based on your mobo & PSU choice, that you do not plan to CrossFire in the future. (Nothing wrong with that, just making sure that you know you're ruling that out.) If you want to be able to CrossFire in the future, you should think about moving up to the ASUS P7P55D-E Pro and a 750W-850W PSU.