I've seem some really nice bulls in Idaho's unit 54. Getting a tag, though, is a pipe dream. The drawing odds for residents are about 1%, even worse for non-res.
Judging from photos I've seen, bulls in transplanted herds in east have some monsters. They're protected and allowed to grow with limited hunting. It takes a few years to grow really big ones. Again, getting the tag is the hardest part of the hunt.