I'm looking to buy a walk behind stump grinder. Any suggestions on a good sturdy brand? Husqvarna makes a 13 horse, so does Bluebird, but I can't find one at any dealers. They all say they can order 'em so I can't really see if they work well, if at all. Any insight on this would be great. If all the smaller brands are junk, let me know that too-I'll keep my money. Thanks