Bright and early -- yeah sure, you guys kept me awake half the night :sqerr:
For me (just personal preference), if I'm going to use a controller, it would be the Denon 4500. Other than the fact that it is incredibly well built, it is also rack mounted, so no wasted space with a tabletop model. I also have a Numark Total Control, and an M-Audio X-Session Pro, which both work well, but take up desk/table space. I'll be getting one of the new Herc Rmx's as well, so I can map that to Rockit.
The next version of Rockit (4.1), also has a MIDI learn facility, so you can easily map any MIDI controller, without having to edit the mapper directly yourself.
Most of the time though, I will just use keyboard shortcuts, or a mouse -- that's just because I am handy with a keyboard and mouse
You can edit your shortcuts to whatever you want, in the Config->Shortcuts section.