I am also looking at a good 61-key controller for my Mac-Logic setup (I use a Roland A-800Pro for my PC-Sonar setup).
The fact is that for electronic styles I think, semi-weighted keys are an impediment rather than a help.. because they are not as fast as synth action.
If I play techno / house / trance / electro house / d 'n' b / dubstep etc. etc. , I think a very light, very fast, and - well, yes - cheap
controller is arguably more fitting than an expensive semi-touch.
Semi-weighted is great to play piano, electric piano, music that requires a very precise interpretation of the various velocity levels in synths and soft synths, but for electronica?
Most of the time, you have straight, fast, full 127 bang on fixed velocity, and add expressiveness using the automation lines anyway.
That said, I'm torn.
I don't know what to get. I think since I play electronic styles, and I'm very good at utilizing light synth action to play expressively anyway, I think something like an Alesis QX61 would be fine, even though the keyboard action is not great (but it's fast).
But I have to admit that the Novation line - the Impulse 61, and especially the SL mkII, have lots of great features (and I really like the action on the SL mkII).
Ah.. decisions, decisions.