I think there is something special about the 800 and it isn't gain. It's tightness, depth and feel. I came from new Marshalls, DSL50, and was searching for something thicker with better response. Even modded that DSL sucked.
As soon as I played the 800 it was a roaring machine, not a gain machine but had the characteristics and great platform that you could build on with a mod or OD in front. The basics are there for great tone for sure. I liked the 2 channel 2205 as well but stock it had some shortcomings, not real thick but still a great amp. 800 is definately the amp that defined the 80s...with mods and boosts of course.