Hi Barry, the biggest concern i have with your build is the psu. The PSU is often the most overlooked component in a system. The problem with pcspecialist is that they don't specify what brand of psu they'll be using.
Also, not sure about the case, looks very cheap & nasty to me.
As for your cpu, mobo & ram. You're doing the right thing going am3. Its either that or i5 you should look at. Thats my opinion anyway :)