Dave Smith Instruments SYNTHESIZERS

I am seriously considering purchasing a Poly Evolver Keyboard.

It would act as a master keyboard controller for my studio (replacing a 
just-sold DX7II FD) and be my primary programming synth (likely means 
I'd sell my little-used Alesis Ion).

Some questions for those who have it:
- What bugs currently exist?
- Do the knobs send out MIDI?  If so, what kind?
- Is it worth it?
- Should I keep my desktop Evolver for use as a 5th voice?  Has anyone 
actually done this?  How does it work?

Given that I have about $2400 to spend on a master keyboard/synth, 
anyone in the group have any other suggestions?  I want a decent 
keyboard, but I am not a very good player, so I don't need or want full 
weighted action.

I need at least the 61 keys the PEK provides (Ion, Nord, etc. only have 
49) but my studio desk won't easily support anything larger than that.