I thought the same way until I ran the R65 this year. Also the cummins rep told me at a farm show he could up the R65 power to 350 if I wanted. It would cost about $600 to have him come out. My custom Harvester friend also told me ( he runs 5 R65's) that he used to run R72, but had switched to R65 because of the price difference and the fact that they trade every year. He said that in Tradeing they weren't able to get more than about $7000 of that $20,000 back on the trade. If you keep your combine 10 years this won't be much of a factor at the end, but of course if you trade every one or two years it is. I've found there is a little known secret in pricing of new machinery (at least to me) For the highest HP tractor or combine of any brand they gouge the heck out of you because they know everyone want's to have the biggest. Usually the next size smaller is a lot less cost and is the same exact machine except for the HP.