Around here (WI) all you see on 99.9% of 9500 10 50's are 6 rn heads. occasionally you will see an 8 but nobody runs anything bigger than that for a couple reasons. To answer your question about what combine to get, I have lots of experience with 6620's specifically Sidehill T2's. They are a very good machine, I wouldnt hesistate to recomend one. Can be a very productive machine. I would have to recomend that you get a T2, there are many improvements over the Turbo's. I like you blvfarmboy and Deere Runner am also in college, and going the same route you guys are... buying combine, although I am searching for a high quality 9500 or 9510 sidehill ( I do custom combining in our area). So if you are interested, I have a Extremely nice 6620 sitting in my shed, give me an email, and I can send you some pics of it, it's for sale. My $.02 Nelson