My experience is severely limited, but our band used a MicroKorg and it's proven sufficient so far. The keyboard is smaller than the standard size, but you can make a lot of adjustments to the shape of your sounds live (attach/release/sustain/release, etc) so unless you're set on playing with two hands, you don't necissarily need a wah wah pedal, since you can do that modulation on the synth itself (but it takes one hand).
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