I have a silver Bach Stradivarius model 37 trumpet I want to sell. I have taken it to a couple local music stores to determine what would be a fair price. This is where I get confused, one store says "Oh, I'd buy it from you for about $500" the other store says "Man! This is awesome, you should be able to get $1500 for it!" How do I determine what I should sell it for? I don't want to rip anyone off, but I don't want to get ripped off either. The trumpet is still in great shape, only a couple very minor dings and it has a 1st valve trigger. Can anyone help?