Hmm ok my $0.02
Your config is weak in 2 important areas namely
1. GPU
2. Reliable, capable PSU : free PSU with case no to the max @@
A suggested $485 AR config featuring an 80+ certified PSU and a GTS 250 (HDMI/DVI/DSub):
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My El Cheapo move to better PC Audio!
http://forums.amd.com/forum/messageview.cfm?catid=13&threadid=153336&enterthread=y