as a cross little man... I believe the done thing is to buy a size down on your road bike size.
I however am in denial about my cross bike and treat and ride it like a road bike what goes off road, so it's not as small as it probably could be.
it does about 60% road/ 40% off road rides, so it suits not to be too cramped on the road. Sort of a small ish frame for the woods with a stretched out position for the road home.
Have you still got your Lemond cross bike? Just seen a picture of it somewhere on here, not seen one before, looks similar to the Salsa La Cruz I missed out on!