Central Il is a great candidate for a rotary. I ran an 76 F until I went to 6r30, that moved me to the M2. The hybrids got better and the sidehills with higher yields created a problem for the M2 6r30 w_sidehill blower when 180+bpa corn was met. The loses going out the back and just crawling with the 6r30 made the thought process begin for an l2_3(bigger shoe). At the time l's were too busy working yet. My dealer shot a deal on my N6, I was reluctant. He had me demo it for a day on my 18+ degrees sidehills. PRODUCT SOlD!!!! A nice series 3 that the previous owner had done most of the hyperizing to, I finished the job. The dealer was happy too, my M2 never hit his lot, he sold it to someone with all flat ground. For your size I would also look at an 83-85 N5 or R5. The exchange price for the F to N_R wouldn't hurt the cash flow as much. The Deutz engine is good for power and longevity, but has to be kept dry and blown out daily. Neighbor burned up his R60 because of plugged fins and soybean fuzz. He likes the R62 Cummins much better. See if your dealer will let you demo the model your after for one day. If it is a good clean well maintained machine, it sells itself. And going from the F to the N_R normally means more wagons or trucks to keep up.