So this isn't quite the normal MTB post, but I'm thinking you long-time MTB folks are the ones with the answers. My girlfriend is only ~5' and I'm building a commuter for her. I'm going 26" wheels rather than 700c due to her size. I'm thinking a light-weight aluminum MTB frame is the way to go. Then just add light XC wheels with slicker road tires, drop bars, etc. Any suggestions on what models I should start looking for?