Thanks for all your replies. Hopefully I will get to see the bike soon. 53 cm is my best guess at a good fit for me. I'm 5'9" but I have really short legs. So I have a slim margin of bikes that I can stand over without feeling overly cramped. In fact, I think this bike might actually have some contact when I stand over it, but I don't want to go any smaller. I think the best for me might be something like this, and swap the stem if I need a few inches extra of TT length.