MarkBass CMD151, great on its own or with 104 cab sounds a dream, and one in each hand for get-in/out. I used to tour with TE AH400 with 410 and 115, needed its own truck and crew. Before that I had an old "quilted" Kustomsound head with a 2 x 15 fender cab, which was the heaviest but best sounding rig i ever had, but it eventually shook itself apart!
+1 to never go back to big/heavy!