You need to tell us more about the 4500.....2wd or 4wd, does it have an FEL, what condition are the tires in? ....too many questions to help right now. BobG in VA
Look at Tractorhouse-dot-com and see if there are any listed there with asking prices (remember that ask ain't getting price). Discount that on the order of 10 - 15% for the likely selling prices.