WV Dave:
Your situation is very similar to mine. I have about 500 acres with about 1/2 of it in rolling hills. Sometimes farm the hay, and other times try to cut it. I have a Mahindra 6000, rated 50 pto hp and 60 engine hp. I really wanted some additionl hp, but the 6500 was not out then. You need to decide how big of an rotary cutter you want to use and whether you want a 3pt, pull, or semi pull type set up. If you thinking 10' pull type cutter, then 50 pto is going to be at the low end of what is required. If your thinking 15' batwing, I think your going to need in the 75 hp range. When I bought my tractor I really was interested in the 5420 JD. Can't remember exactly now, but I think it is somewhere in the 65 hp range. Before that I owned two other JD tractors, a 970 and a 4500. Really like JD, but in my mind, after doing alot of investigation, decided the JD was just too much money. Yes, when I sold both my JD I got all of my investment back out of them. However, I now have a 60 hp tractor, fel, backhoe, all for about the price of the 5420 alone. With my 6000, I can pull my 3pt 6' cutter just about anywhere at a good pace without any problem. Most of my cutting is tall grass, that is thick and hard to cut. If you and your friends were smart enough to put together the purchase of 600 acres, surley you can see the wisdom in at least considering all the tractor options out there to make the right decision for you property. If spending the money on the JD or NH is the right one, then do it, but, and as many others have advised on this board, buy all the tractor you can. I'd rather be over hp than under.