OZ, I'd go for the TR-99. As NH has added more hp the capacity has increased and so has the wear on things like augers, elevator boots, and even grain tank bottoms. You'll never find a better TR. Don't forget that the TR-99 has 3_4 inch wider clean grain elevator and a faster unloading auger. They both help in high yielding corn. I have no complaints at all about the 99. They have continually improved the TR's since the 80's. My only improvement would be to change the bubble-up auger. NH is still working on updates. I think they are now on th 5th or 6th one. I would put a vertical hyd auger in the grain tank and eliminate the u-joint that seems to be the core of the problems. Good luck!