The way I see it, the original deal is done. You agreed to give him the iPod for the Box-O-Maxx. You ended up throwing $100 into it to get it running. At this point, the Maxx is yours. And it is yours to do what you want with. If he screwed up and she's pecking at him to get it back, it's basically a new sale in my eyes. Make him pay what it's worth on the open market. And if you like the truck and want to keep it, then keep it. He's the one who screwed up and you don't owe him jack. Hell, if his nuts are in that big of a sling, I'd sell it for market value + $50 just because he's desperate.