Red has offered to buy me a couple of new toys, one of which is a new Tmotor.  It will be a newer version of what I have.  Mine is a MG TE 82 with a 45" shaft in good working order.  I just don't knot what I could get for it.

Any ideas?

Caveat,..I normally price my stuff to "sell" and I tend to price stuff low enough so that I'm not going to feel that bad if it needs some repair work a few months after I sell it!!
So, with that in mind and assuming that it's at least a few years old,..I'd be looking to get about half of what a new (equivalent) one goes for.  Bear in mind that you're selling it without any kind of warranty,..so IMO you shouldn't be expecting anything near what a new one costs.  That's just my $.02 about stuff like this.

2 things though,....if you don't actually need the money I would suggest holding onto it, since sooner or later your brand new one will need to be repaired and if you still have the old one,..you can avoid any down-time!  
The second thing is that with as much as you like to fish when it's windy,..I would suggest getting a longer shaft on that new motor to help keep it in the water on the "bouncy" days!