You're going to be pretty much limited to a 25 key controller since there are not very many 37 key options these days...if you could manage a 49 key controller your options will really open up...
25 key controllers have octave up/down buttons to quickly shift them into different registers, so once you have become accustomed to the workflow you will probably have no issues with the limited number of keys...
I have the Nektar LX25...it's an excellent controller, has a good number of extra assignable knobs, and the drum pads are assignable inside the unit...true portability may be an issue with it, but if you need full size keys it's going to be an issue no matter which controller you choose...
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