Space Marine Transition Collectors Guide

I've been collecting early Space Marines for years now, and the early 90's sculpts are some of my favorites. Recently I noticed a fair amount of material circulating on the boards regarding Marines from this time period, so I figured I'd get a collector's guide going. We will define "transition marines" as being from somewhere around the '89-'91 period, but some miniatures may lasted in the range a good deal longer. If you have any scans or information to add here feel free. I can be reached through the Yahoo group ([1])if anyone has any questions or comments.