Forget weight, forget transporting, forget EVERYthing except the setup you'd most like to have on a gig. What would it be? For me:
B3 & Leslie 122 or 122R + Rhodes MK1 in 'L' configuration with 2 12" EV's for the Rhodes. No Synth, no Workstation, no Stage Piano, no Arranger KB, no Controller/VSTi. How about you? (Don't respond with "solo or band gig?", or "what's the venue?", et. Don't factor that in, just list your 'dream' rig.

chas