If he sells his cpu, ram and mobo I doubt if he'd get much
more than a $100-125. You can get those 3 items brand new
for around $200 or so. And you said your wifes PC was an
HP. You'll probably have trouble upgrading it. They tend to
be propriety. The power supply may not be pinned the same
as a standard one. The case may have odd connectors for the
power and reset switches. I'm not trying to scare you off, but
you may need to spend a little cash on her PC to use your old
parts :-)

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