The company that makes Bison blades also makes at least some of the blades for Frontier/John Deere. I have a Frontier RB2284 and it was made by them. Mine is a 7', category 2 only, manual offset, manual tilt, and manual angle blade weighing a little over 750 lbs with a full manual setup. There is an option of hydraulic offset but the rest is manual-only. Deere rates it for up to 80 PTO HP on a 2WD tractor and 70 PTO HP on an MFWD tractor. The Bison-branded blade the Frontier RB22 series is based on has a different turntable and has the option of hydraulic offset/angle/tilt which would make it a little heavier at a little over 800 pounds if you get all of the hydraulics. It is rated for that 65-90 HP range similar to the Frontier, so it looks like this is the unit the Manhindra dealer is carrying, not an actual 1000+ pound blade, as those are rated for north of 100 HP.
I run the RB2284 with a Deere 5075E with loaded ag tires. The blade is plenty stout for my tractor, which is heavier and more powerful than yours. The quality of the blade is good. The only thing I might have done differently is go with the 8' version to get a little more reach to the side. You likely do not absolutely have to have one built that sturdy with a 60 HP hydrostatic transmission tractor (particularly if you don't have loaded ag tires), but it would handle it just fine. Just make sure you have a loader or other front ballast on the tractor.