I'm 6'0" and am riding a 57 kilott. Fits pretty good. Got about an inch between the toptube and my jewels when standing over it. I probably have average to long legs and arms, but I don't know what length should put me in what category. I also wear a size 11 shoe and have the smallest of toe overlap.
For those of you who haven't already checked out the "Mercier Picture thread", please do so, there is a chock full of info there. And, yes, i know there are alot of pages, and some useless threads in there, but just take the time to go thru it, and i'm sure you'll find answers to your questions about this bike.