Virnig makes a solid bucket. I bought one of their rock sifting buckets and I use it a lot. It's heavy, too, which means it's got some iron in it.
I use Bobcat brand 4n1 and it's been good. Had it since '07 sees mostly farm use but it is built very heavy and closes strong. Will nearly cut through a t post (not saying much) but pretty cool to see that much power.
It's only a 66 inch but I've used it on my s750 to pull posts and dig with and it handles that stress fine.
I haven't owned Bradco attachments but some of the rental places carry them and seem to like them.
"Life is tough, but it's tougher if you're stupid."