A few months ago I was contemplating the same thing since I was out of town for a long stretch of time. It's unconventional and doesn't have quite all the features that most traditional keyboards have, but I ended up purchasing a Launchpad Pro [1]. While it does not offer a traditional keybed, it is surprisingly playable and feels very musical in its note mode. It also has a chord mode that makes building up chord progressions and riffing on them. It also has a reasonably featured 4 track midi sequencer built in. And of course it can be used as a drum pad and can launch clips in Ableton and Logic (and I believe there is a script for deep integration in bitwig studio as well?).