Highly portable controllers

[Synec]

No one mentioned the Denon Sc2000?? Get 2 and youve got yourself 2 emulated and super portable cd-style midi decks

[MrPopinjay]

But no mixer section so you'd have to carry around a secondary controller.

I'd get a korg nanokontrol if you're going cheap and one of the faderfox pieces if you want something quality.

[jprime]

iphone / Android / TouchOSC.

Uber small and portable.

[Globalz]

if your doing gigs
Laptop
Launchpad
soundcard
wires
good to go