Take a look at the mtbr forums, too. Surly is just a solid company that makes solid bikes. I know two people that have sold their Karate Monkey's for a Niner, Salsa, etc., but both regret selling them. They're not the lightest bikes out there, but they perform solid. I've found the same with the Steamroller. You'd probably have lots of fun with the other bikes, but definitely won't regret getting teh KM or SR.