Thanks for the advice Matt - even at 130 quid I'm looking more than I have available. What I was able to come up with, however, was replacing the mobo. I can get into a seemingly well rated MSI mobo that will accept my AGP 8x vid card for $80 Canadian and it will accept my 3.4ghz chip I have "lying" around - much less expensive than 130 British (I'm guessing it's almost double that in Canadian funds).
So far that's what I think I'm going to do - more work, reinstall the OS *again* but I think better in the end.
Of course more advice is always welcome - nothing like too much info, right....