First gen Shimano are my choice
What do you mean Finney about the rear mech? Just not sure as I was working in a bike shop when they came out.
operation isn't that great going back up the gears from 6th to 1st, ok when dropping the other way though - just my observation. the ratchet ladder is a bit sticky? if you know of any tips to make it run smooth in both directions then i'm all ears. does look the business though.
and if anyone knows a surefire way of getting the 600 delta calipers to work without having to employ prayers & voodoo then perhaps start a thread with a guide - that I would be very interested in...