I went from a MF 65 to a Yanmar 276D (4x4, powershift, 12 speeds forward, 27 engine hp) It's amazing what a 4x4 tractor will do, compared to a larger 4x2 tractor.
Front wheel assist is like adding 10HP,IMHO.Good luck in your research,they are out there.Good advise to check your local want ads(Craigslist ect.),lots of home owner type tractors with low hours.
My BIL purchased a L3300 Kubota,with loader,front snowblower,rear blade and 170 hours(1996 machine) for $12,000.