For real portability, BeatStep Pros. You can't beat 'em for a grab-n-go sequencer. 2 channels of CV/gate/exp, 8 drum trigger outs, sync I/O plus MIDI. Plenty of scale definitions, plus loads of user programmability via the USB port + software, plus they're built like all the other Arturia stuff: pretty rugged. And cheap at $249. But if we're talking the larger-scale stuff, look into the Koma Komplex...too much to describe here, but it's about the do-all of analog sequencing environments-in-a-box. And, natch, the ultra-cheap SQ-1 for when you want to drop a sequencer into a setup somewhere and you want a couple lying around for that purpose.
Digital-wise, the Kilpatrick Carbon's not bad: 4 channels of CV/gate, SD storage, plenty of USB and MIDI options for $700. But beyond that, it would make more sense to build some MIDI-CV stuff into a modular cab for extensive control via a computer or iPad; for that, the Expert Sleepers FH-1 and its expander, the FHX-1 (you can add up to seven) is just about the perfect solution, as you can then use MIDI, CV from Silent Way, etc with the appropriate MIDI converter box (Perfect Circuit suggest the iConnect MIDI 2+).
I'll puzzle on the mixer idea...give me a day or two to compile some suggestions.