Nice looking machine - wheel weights, too, if I'm not mistaken...
I don't have a good answer for you, but about a year ago I talked to a dealer about trading / selling my tractor, looking to move up. He suggested that I try the open market and sell it privately. I have a 1997
B7300, 4WD, HST, FEL, 48" Rhino rotary cutter and he said maybe $8K. Maybe. I also have a Woods 6500 BH that might have added $3K.
Since anything I'd want to buy would cost me at least $20K this wasn't an option for me. I own all these things and while they may not be everything I ever wanted they sure work just fine.
So I don't really have an answer for you, except that when I have considered selling my equipment it has always been for a lot less than I think it is worth...or maybe just a lot less than it is worth to me.
BTW, I did read one of your follow up posts and I wanted to let you know that I am really sorry about your injury(ies) and hope things go well for you. Best of luck to you...Chris