Well, for most people, head tube length isnt a problem. I have a very short torso and very long legs, and so I need a taller-than-normal headtube and a fair number of spacers in order to get even an aggressive fit. My Ridley has a 175mm top tube and even with 20mm spacers and a non-flipped stem, I still have about 5.5" of saddle to handlebar drop.

As I want to set this bike up in a slightly less aggressive geometry, head tube size is a very valid consideration for me, unless I want to have something like 50 or 60mm of spacers or a full-erection stem (either of which I prefer to avoid, if I can).

So, back to my question