I agree that you should stay far away from benzoyl peroxide. My skin is fairly tolerant, and even just a whiff of BP is super irritating. Even though I've never tried ProActiv, I'd never go anywhere near the stuff if it has BP in it.
ProActive is nasty stuff. Even for its intended use, acne, it effects are debatable. Check out these MakeupAlley reviews for ProActive -
http://makeupalley.com/product/showreview.asp?ItemID=23657, there are over 2500 and many are negative.
I would consider going the alpha hydroxy route. I've just started experimenting with it myself, and I haven't had any irritation as long as I stay at about 4% concentration. Here are some good reviews of alpha hydroxy lotion -
http://www.alphahydroxylotion.org, they list the top 5 bestsellers.
http://www.Acne.org also has some relevant information.