JimmyD has the 33" and loves it. I've tested all three and am looking to purchase the 28" in the near future. It allows you to change the position of the head in the reflector for a wider variety of looks. It has steeper falloff than the other models, but I shoot a lot of B&W and like that look. The 22" is too harsh for my taste by itself, but that's just me. Mola now makes a 43" reflector (which I haven't tested) that a buddy of mine in NYC swears by. For what you want to use it for as described in your post, the 33" or 43" would probably be your best choice.
-Chip
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People who do stupid things with dangerous substances often die! -me
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