I've been considering purchasing clincher carbon wheels.  As I've been reviewing, it seems like there are hundreds of choices, i.e., Zipp, Easton, Reynolds, etc, and the price range is all over the board.  Then, there's the question of whether to buy 50mm, 60mm, 80mm, etc.   I ride about 30 miles daily and more on weekends, and do some centuries.  Looking for some advice from other cyclists.  I don't participate in races, but I would like to improve my time and maybe some comfort in the centuries and on long rides.  Any suggestions?