110C on 6 different machines? You must be using it on a fluffy down comforter or something like it that covers the vents, thus causing the machine to literally cook itself. Sorry you had such a bad time. I'd always recommend a Thinkpad laptop for your switch back. I'd tell you to try Ubuntu, but it sounds like you and that OS wouldn't play well...
If he's killing MBPs with such ruthless efficiency I doubt a ThinkPad would fare any better. ThinkPads are the laptop of choice where I work and they're well made and very sturdy, but they're not ihatemymbp proof. Maybe one of the military spec Panny Toughbooks?
Oh and Target disk mode for the win to get his data off. If not, yank the drive and stick it in a caddy. It's not rocket science.