I'm learning the advantages of a 4x5 round bale and think that size would be beneficial to me in several ways. I've also researched some 4x5 options that from Vermeer, MF Hesston and others that claim they need a minimum of 40hp at the pto. As you all have mentioned I suspect a unit with a minimum of 40hp would run much better with a 60hp pto and the weight that usually accompanies that pto hp.
It seems realistic, given a flat enough property, that a 75 hp tractor with a 60 hp PTO should handle a 4x5 baler if you research your baler requirements before purchasing.
I realize there are better option but the 75hp tractor will be stretching my budget and with the information I have I think it is capable, even if marginally capable, of round baling 4x5's with the right baler. Everything else I would use a 75 hp tractor for would be well within its capability on the properties I'm looking at.
Now the question becomes can I afford a 75 HP tractor. I really like the Case 75C or the New Holland Powerstar 75 because of the weight per horse power. What price is a good price for either of these cab and FEL models new from a dealership?