May I ask is this "traveling" for gigs or vacation etc,.... as these mentioned dont have arranger features unless you playing against backing tracks?....if sacrifices have to be made for travel only smaller (keys)
but certainly gigable as I can attest to many times Ive used it on stage the KORG Micro is perfect styles, lightweight great sound on board speakers.....for practice or travel its very efficient.

http://i.korg.com/microarranger