I'm looking to replace my leader-class energon optimus prime's cab. the one I got when the series launched had bad hips, and as a result, he liked to throw himself forward at random, destroying a lot of his paint applications. I'm trying to find one that has the full mouth plate, and all it's paint applications intact. windshield, and the various silver parts are a big concern. but I have no idea how much I should pay for such a thing. I don't want to overpay, and I don't want to insult any sellers I find by offering too little. so help, please?