Oddly enough, while I have lots of equipment, I rarely use anything other than one Sunn head (the model T if it's a big gig, the 200S otherwise, occasionally the Sentura II), a homemade 1x15 loaded with a JBL 2032, and another homemade cab with (I think) a JBL 2108 8" driver for highs. For a big outdoor gig, I might take the Model 215. But I've yet to set up the Model T, 200S, Sentura II, Sceptre, maybe the Concert Slave and run them all into the Model 215, both 200S cabs, the 1x15, and maybe supplement them with the 410S stack and the 2x12 (probably Solarus) cabinet. If I still wasn't loud enough, I could break out the Concert PA and its cabinets, each with one D130 and a horn!
But really, the 200S and one 15" seem to do the job in almost all cases.
Ryanx, I like how you worked the two 412SR cabinets in there!