In some ways I side with Jeff S. on the big dob side. But for the most part, I think an 8" or larger SCT in alt/az works best. You need something sturdy for all those people that grab the eyepiece and give it a crank or hold on for dear life. I would also vote for a 10" or so dob that doesn't require more than a couple steps up a small step stool or ladder.
-------------------- Don Wyman Obsession 18" f/4.5 #1166
W/Argo Navis DSC and Torus Primary
William Optics Megrez 90
Coronado PST