how much would you pay for a used 150GB WD Raptor drive?

[tahoedrew]

Got a good lead on one from Craigslist... it was originally listed at $40, now at $60, though the lister has said he admits he's adjusted the prices and would be willing to negotiate. I want to stick it into my 2.5GHz G5 as a boot drive to replace the current 160GB drive (there's a 1TB WD "Green" drive in the other slot for media and storage).

So, while I bit immediately at $40, $60 seems less like a RYF. I don't know if I even want it bad enough to offer him $50, so thinking of just saying I'll buy it for $40 but nothing more, am I driving an IMPOSSIBLE bargain?

~A