How tall are you & what size frame do think is best for you?

[Ductape]

To me the biggest variable is how rare the frame is and how much the seller is asking. I can make just about anything work.

Seriously though, depends on the era of bike you are seeking out, arm, leg, torso length, and you general fitness. Stem length and rise can create a big difference in how a bike rides for you.

I like my bikes much more upright now than I did in the early 90's. By the general lack of available short stems from this era available now and an overabundance of 150mm stems, I don't think I am the only one.