Not that I would support your decision to go with another brand at all, but if you did I would choose the 9790. Just take some time and compare the 9790 to the 9860 and you will see the advantage right away, its called simplicity which agco is striving for their customers. I ran a 9790 with the 75 and the capacities are similiar on flat ground, it wont keep up on the side slops though. The STS is a high cost of mantaining, not that its a bad combine, but parts wear out and it has lots of parts. If you like your Gleaner I would stick to it, you know how it operates and that means alot, every combine has a learning curve. The Massey is a very simple harvester though, if I switched it would be a 9790 or even an 8780XP. I have heard there are some really great deals on those older models right now.