Boss AW-3

For this price you can do everything you want
Pro's
Envelope Filter as well as Autowah
Sounds good and never clipping
Easy enough (a Filter pedal is always a bit searching between different parameters)
Also up mode and an extra normal mode
Expression pedal

con
I don't like the decay knob for the envelope modes. I'd rather had an Q/feedback function. Of course this is also why it is an easy pedal. They replaced the Q by an extra normal mode with higher Q.
Also I have the impression that the filter on the MD-200 sounds better But everything on the MD200 is very high quality of course, The AW-3 sounds good anyway.