I am currently running Shimano C35 on my existing bike (Trek) and have decided on a Speci frame and groupset but can't decide on the wheels. I am looking at the Zipp Firecrest family and thinking about the 303 size or do. Just get another pair of the Shimano wheels. I have a pair of c50 wheels that I have found to harsh a ride on my existing bike and rarely use them for that reason and I am concerned that the zips may be the same. Any advice would be appreciated!