Looking at possibly upgrading my 2000 8780xp to a 2005 9790 and am wondering how much more capacity ,ease of use reliability etc I would gain. My 8780xp has the updated front beater, the ATR rotor, mav chopper, engine set at 300 hp , fieldstar, about back auto stear. The 9790 has 1000 threshing hrs and my 8780xp has 1500 threshing hrs. Also what kind of money difference would be a good deal ?