I'd consider stepping up to the X3 425 or X3 440 to get an even faster CPU.
Here's a cheap PSU/optical combo that would save some money: OCZ ModXStream Pro 500W and cheap SATA DVD burner
$44 after rebate.
You may want to look at additional cases for something that's a little cheaper. The Coolermaster Centurion 5 is a good cheap one.