Come try out Showdown MUD. We started out as a Circle-Diku, and it's been heavily modified. No stock areas.
Classes include Magician, Cowboy, Cop, Cyborg, Monk, Shaman, Assassin. 60 Levels, plus Remort. Currently, Remort means you go back to lvl 1, with better stats, but they're working on changing that.
It's got a small playerbase currently, and a small handful of Imms. Lots of areas to explore. You're allowed to play 3 characters at once.
It's a world of swords and guns, spells and skills. Areas are based on TV, movies, sci-fi, fantasy, horror, history, twisted realities, and our own imaginations!
Review here. Slightly out of date.
Showdown MUD at mudhost.com:4445