How much would he sell for?

I was just wondering how much my horse would sell for.. He's a 14.2 welsh cob, section D, he's 7 years old and will do pretty much anything. We have had to do a lot of work on him as he was stiff on one side and keeps picking up new tricks as he's only a youngster, he would go with a saddle, 2 bridles, 2 headcollars, 6 rugs and his windsucking collar as he is a cribber:) oh and he is a bay horse with a white sock on his back left:) he has a simple diet and hasn't had any reason to call the vet out.. He is a bit of a rescue pony as he came from scientists tesing drugs on him:( sorry, I went on a bit.. Just desperate to know how much to list him for:)