What size pompino should I get?

Hey Rob, just to confound you more, I'm 6" on the dot but I have short legs (it's true, what can I say) and I ride a large Pompino with the seatpost cranked up. I would say a Small is definitely not suitable, a medium will be good if you want it a little on the compact side.

My main advice is to buy second hand although give it a good look over before you hand over the cash, especially around the rear triangle. I'd never pay full price for a Pompino again, even though they are mega cheap. Five have broken in the polo scene in the last year.
i've heard about this before. What exactly am i looking for? will there just be an obvious crack near the dropouts?