I'm going to try to be fair to AMD here, before everyone here says you have to go intel
I've read that motherboard is a pretty good budget board. Its got some nice features and can overclock Athlons pretty well and Phenom's not so great. But the overclock potential is increased with one of the newer BIOS'.
As for power supply, I assume you're refering to the default 500watt supply. That'll be enough to run it even with a few upgrades.
Now, are you sure you cant build your own computer? You would get a lot more for your money if you built your own.