Bitstream 3x:

Definately the nicest of the midi controllers, especially cause you can talk directly to the developers about improving certain things. Automap has been standard on these things for ages.
couple key points... fully programmable midi LFO and ARP
35 knobs - 8 sliders - 16 buttons
Dual axis analog joystick
Ribbon controller
Cross-fader
Endless encoder
Foot switch input
7 curve models per control
(lin, inv lin, log, inv log, random, users 0 & 1)
Sync-24 output
Expansion port
Built-in programmable LFO
Built-in enhanced arpeggiator
Built-in 8 tracks motion sampler
MIDI IN / THRU / OUT 1 / OUT 2
USB compatible, driver-less
USB powered
Transport functions
Fully programmable
Large graphic display (with backlight)
100 snapshot scenes, 64 arpp scenes
21 fully programmable groups
Jump-less potentiometer mode
Built-in MIDI merger & filter
4U metallic enclosure