I would pay a higher price for a more advanced Faderport (the Faderport Pro!).
Lower profile, sleeker look, much improved displays (OLED?) that are easier to see and read, quieter fader movements. I absolutely love the Faderport, but it does have a certain toy-like look to it - it's kind of hard to articulate why, but that's the feeling I get - it doesn't quite feel like I'm in a professional studio. I'd even accept a slightly wider Faderport 16 Pro to have slightly better spacing between faders.
And some way to know which channel is selected even when in edit plugins mode. I actually keep a 1c coin sitting on top of my faderport which I move to whichever channel is selected so I can remember which solo button to press when I want to check the specific track whilst still editing some plugin's parameters.