Trade consideration

[GsurgBM]

I'm considering trading my bluesy 16613 for the updated 116613 with the Maxi case and ceramic bezel, as well as glidelock bracelet. I really like my bluesey, but find I don't enjoy the shape as much as the newer models that just feel a little more solid, and that I don't wear it as much. I think if it were the updated case I would wear it much more. Just a total preference thing I guess. Anyway, if trading my very good condition bluesy from 2004 or so in towards the new model, what do you guys think would be an acceptable amount of cash to add to trade up? Mine was last full serviced three years ago FYI.