My guess is that you are looking at Cat. 2 blades. Any of those brands listed will be made to take a great deal of stress.
Are you looking for any special feature (like double offset, hydraulic, reversible, self-standing)? That may influence your choice.
This is a Gearmore GB85. Quite substantial and well built.
I've got one of these hydraulic Leon blades:
Leons Mfg. Company Inc.
It works really well, I'd recommend it to people. Probably don't need the 200 hp model but you can't break it. I've got it on a 100 hp / 11,000 lb tractor.