If you're torn and its running well, I'd list it for sale at a high price. You can enjoy it in the meantime, and if someone comes along that wants to give you $7,000 for it, you can cross that bridge when you get there.
I think after I get my civic fixed up, I'll list it for like $4,500 just for the hell of it. If someone wants to pay that much, cool, if not, I'll just keep racing. :dunno: /wishful thinking