Looks pretty good. Here's a few changes I might make though.
First, make sure you are getting this revision of the X4 955AMD Phenom II X4 955
Then consider this RAM with tighter timingsG.Skill Ripjaws
Consider a 5750 instead of the 9800XFX Radeon HD 5750
For overclocking, you may want to add in this HSFCooler Master Hyper 212 Plus