I'm a Yamaha fan, I have MX61, MX49, reface DX and some other synths (Kawai ES110 88keys hammer).
I currently use MX61 in most cases although I miss some keys and maybe a hammer action so I have to carry a second keyboard sometimes.
I may buy the new P121, which along with MX49 will do anything. 3 sounds at the same time (one from P121 and 2 split/layer from MX49, or other possibilities) hammer and synth actions, but 2 keys and some more weight to carry.
Alternative and lighter setup is only the MODX7 (or maybe MODX8 although a like semi actions), but is the MODX capable of splitting 3 sounds simultaneously? I do a lot of splits and also a 2sounds split with 2parts(layered) per sound or at least split 1part sound with 2parts (layer) sound will be very usefull!
76 keys are a lot enough for doing such things, I have done splitting to 4 sounds in Kurzweil SP4-7 in tha past, and since in one of my group (soul, r&b, pop/rock) we don't have a guitar (only drums,bass,keys,vocals) it will be nice to fill some space there...