That's actually one of those systems where he might only save a few hundred dollars by doing it himself. Not worth it at all. I added up all the components as best I could on Newegg and was at roughly $4200 not including tax.
I wouldn't bother with Opteron in a single configuration. It adds a bunch of expense without a large performance increase over similarly clocked Athlon 64's.
The 560J might actually be a bit faster than that Opteron. It would be close. Definatly the Xeon is the worst performer, but it's offering future 64-bit OS compatability.
I'd see what they can get you in a faster A64 processor, such as the 3800+.
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