The NI round balers did have a soft core, like Ross says. At the time they advertised it as a good thing. No one around here had one though. Mostly Vermeer and NH up here, with the die hard greenies running Deere balers.
I've got a 12' Hesston center pivot, PTO hydraulic drive like 800's 499. I have to take the loader off to run the lift and swing though, or get a Fasse valve for it, but they're another PITA. I run it with my 65 horse 180 Massey, but it's a heavy pig that pushes ya around in my hills. I'd like to have 80-90hp in front of it, in 4 years when I'm doing hay again, it'll maybe have a bigger tractor on it.