Reply to Need an Ableton Controller (thinking of Twitch and dual X1)

Hi I'm new to the community but have been reading DJTT for a while now
I am currently interested in DJing and tried Traktor but wasn't really satisfied. Then I tried Ableton which got me pretty serious and I want to get a controller for it. I am believeing of the Novation Twitch as the main controller because novation made it easy for Ableton users to have twitch as a controller using the Live Twitch Translator program. I am also interested using two X1s for FX controller and possibly clip controller.

Not really intersted in APC40/Launchpad style contorller that has too many grids because I know i won't be using that many channels live.

Any opinion on this setup? if it is good I might get it.
Another question for those who have twitch, is are the knobs on the top right (controlling cue/master) midi mappable or not?

*EDIT
- Anyone has a Behringer DDM-4000? because I am also interested in this mixer instead of the Twitch because I might not be using a lot of twitch features in Live.