The catalogs are online, so you can compare and decide for yourself.
The '93 with the Ritchey biplane fork is probably the most sought after:
http://www.sheldonbrown.com/bridgest...3/pages/37.htm
Some people don't like the earlier models with more "kick" in the fork.
All MB-1's were lugged and made in Japan.
MB-1 prices were extremely high when I was looking for one. I ended up buying an MB-2 and upgrading the components.