I think the case is far too much of your budget, but if you like it that much and want it for future use then go for it.
Would definitely change out the power supply. Go for something corsair, seasonic, or as mentioned above, the earthwatts aren't too bad. The wattage is not the only deciding factor in a power supply.
The motherboard looks good (only negative is lack of crossfire support, but excellent for the price)
Phenoms are generally better gaming CPUs than athlons because of the L3 cache, but that processor will likely serve you well for what you want.
The hard drive is fine, but you can usually get the 500GB version for just a few dollars more (I have one I got for $59).
Definitely change out the GPU. There was another thread last week about budget graphics, and I will again recommend the same thing. If you have to keep cost way down on graphics go for an HD 4670 and if you need the cost to be lower than that go for an hd 4650. Good article from tomshardware for
best gpu/$
^^^also agree that the build Fox put up and his recommendations are excellent.