Golfsmith's clubmaker area probably has the best shaft comparison resource.
Go get fitted properly by a club-fitting pro who will make your life a lot easier in the decision process. Find a TGM pro/fitter and you are double ahead.
My advice is to get on the phone and talk with one or two of the club makers that have internet shops. Some of them have a pretty broad and deep knowledge with regards to various shafts and heads.