If you really want to move up to a different combine go for a TR99. Do you really want to give up that beautiful grain sample with no cracks. Do you have electronic stone trap on your TR98IJ
I can't believe you could be picking up rockswith a TR- combine if everything is adjusted properly. The NH stone ejection system is the best of all, especially with the electronic stone detection system. I can't see where the Cat combine is even comparable.