Big surprise, I'd vote for the four Line 6 pedals (the AM4 doesn't count, as it's stupid). I might throw in a Whammy for some pitch shifting, although I don't know that it's the most versatile pedal. I don't think I can claim an Eventide as "floor-mountable" though.
EDIT: tommyboy27 posted while I was writing (and pretending to do work here
). It reminded me about wah, so I'm going:
FM4 -> V-Wah -> MM4 -> DM4 -> DL4
Hooray for modelling (and yes, it sounds good).