good controller to upgrade to?

hey guys.

recently bought a control instinct and have been having a blast.

now though im feeling a should have bought a slightly more advanced and robust one. im wondering what you guys suggestions would be?  

are the air or rmx 2 controllers much of an upgrade, or wont i notice much difference really?

thoughts?

regards,
butt 

Blast? Oh...
I hope it's not because the controller?

Maybe RMX2 - the best choice?
He has a normal pitch fader and 4 modes for PADS...