I'm 6'4 and picked up a 61cm Concept recently.

They come up on ebay every week or so. Usually 1 or 2. The Moto track is a good deal. Similar frame style and the components are decent. Namely the octalink cranks.

Other than that you could get a super pista, they look decent and probly ride the same. I would expect to pay the same price for a super pista as a used concept... or close.