First thing, don't use amazon. Use NewEgg
Their browser interface is much simpler and they are guaranteed to have a better variety.
Though as far as I can see this build should work, no errors at first sight. I'm glad to see someone go for AM3 socket, it's underrated.
As for improvement? I would need to know 2 things:
A. What the computer's main purpose is
B. What your budget is.
Hope you can get back to me