Looking for a controller to add to my S4

Hey, i currently have a S4 Controller and im loving it, now i would like to be able to do some remixes on the fly, have more controle over effects etc and i was wondering what would be the best to buy, I've watched various movies and overall im leaning towards to NI Maschine.

Akai also seems to have pretty decent Controllers outthere, but are they able to remix on the fly? Im also not very used to Ableton so i guess that would be a big learning curve there aswell.


Im mainly into Elektro/progressive House and Dubstep if this matters towards wich controller to get.

Cheers in advance.