Re: What rackmount synth or synth module has the most lights on it?
As a side note: unless you really want the DSI sound, I'd recommend against the Mopho Desktop, look into Arturia or Novation BSII. The Mopho Desktop is just not a joy to program like these others. Though you can get a damn good deal on them often these days.
Since the OTO Biscuit is now also a synth, it's got a fair amount of purty lights. But not like most of what got posted above.
The key is to collect a bunch of stuff that all looks blinky sexy awesome together. Gives a whole new meaning to the phrase "nice rack"