Hi, I'm getting more and more interested in a Fat purchase after 15 years of hardtails. I've owned several "cult" bikes - 2 Bontrager Racelites, an Ibis Mojo and 2 Ibis Alibis, one of which is my current ride, which by the way is a great bike. My question is what size and which frame? I can't seem to find frame dimensions anywhere on the web. My current Alibi fits perfectly, their medium, 71/73, 23" tt. I'm not sure if I need a Fat M or M/L, I'm 5'11", 32" inseam. I'm even considering going rigid (!). My rides are mostly these days asphalt with the kids and relatively tame singletrack/fire roads. Is it a Yo or will I be happy enough with a Buck if the M fits me? Sorry for the wordiness but it seems Fat people are this obssessive about their bikes. Thanks.