To be honest, the Korg's vocoder is really above the ordinary compared to most of what you can buy today. Orange is not that brilliant really, it's difficult to get really intelligible sentences with it. Although perhaps you're only in it to make cool sounds.
Anyway, Orange is one of the better plugins on the market even though it tends to have that certain "Orange" sound no matter what you do to it.
The vocoder in Logic, EVOC20, is the best I have found as a plug-in so far.
You can play the Orange vocoder using MIDI.