I know this is a late post, but FWIW I have a 755 4WD with 60" MMM. 70 FEL, 5' rotary cutter, 72" back blade and 72" york rake, 5 1/2 ft disk, and 48" box blade. I mow about 2.5-3 acres, rotary cut another 3, grade and remove snow on a 225' drive, clear brush and skid trees/logs (up to 6-8" diameter and 8 ft long) with it.
My terrain is moderately rolling in central lower Michigan, We had a nasty 8-10" wet and wind driven snowtorm this year, but the blade, 4WD, and box blade on for ballast handled it just fine. For skidding logs for firewood (I do the same thing) it works fine, occasionally a little underpowered going uphills, but you just slow down and it gets it done. I looked at 855/955s also, but prefered the smaller size of the 755.
BTW, I also had a great 318 I planned to keep for mowing, but the 755 is so nimble and versatile, I sold the 318. All around, it has been a great tractor for everything from lawn mowing to levelling areas with the BB. Hope this helps.
-AJ