Seems a pretty solid build to me...looks like you've definitely done your homework. I can't really recommend a PSU until you have chosen a GPU though since the GPU is the most power-hungry component in a modern system. You may find Tom's article on the Best Graphics Card for the Money - July 2010 useful for choosing your GPU is you're not sure:
oh my god, every part you picked is wrong! your PC will explode with those parts!!!
the parts look good. make sure you get a PSU that can handle any video card you decide on. microcenter is selling the CoolerMaster 212+ for $20, it a fantastic price for a HSF that cools better then the stock AMD and makes far less noise.
plus the athlon II x3 440 is made to be over clocked