get a top of the line masterkeyboard, amd then montage, kronos, tyros, motif, integra, v-synth, norld lead4 rack all setup behind that keyboard easilly in reach...
Or just one workstation to do it all?
Well, I wouldn't like to carry your Tyros 5 and Kronos to a gig. So mostly I take my MoXF, or maybe in future rather the BK-9 depending on the occasion, and it's easy to additionally put the Integra into the equipment suitcase. But two full-size keyboards, no thank you.
If the Montage alone could replace everything, it would be great, but that's obviously not the case (and it wasn't to be expected). If it even really has no internal sequencer, as people in other forums seems to be convinced of meanwhile, I couldn't even use it like my MoXF, having a pre-recorded solo trumpet play together with my live strings/harpsichord part, just to take one example. And it's no arranger of course.
That's why I love module versions...