Invisix:
Not sure what prices you see for A4000's, but an outfit in Mission, KS may have refurbished A4000's for between $400.00 and $500.00...(Video Lab, owner is named Ed Jeffries) I don't have the phone number handy now, but you could search A.org... This guy is pretty good, motherboard is cleaned, all ports and drives tested, etc. He repaired both of my 4000's. Not sure how much a tricked out A1200 costs, but I seem to recall paying about $500.00 US for my Blizzard '060 and SCSI module.... not including anything else....
P.S. my $500.00 A4000 came with a WarpEngine/SCSI/64MB, not too bad as I spent upwards of $1000.00 on my first 4000 (many years ago)