I need to get some new shorts and I would like to try Pearl Izumi. Is there are big difference between the Ultrasensors and the Attacks? I want decent padding for longer rides, but I don't need lots of thick padding that will bunch up and give me saddle sores. Has anyone used both of these? Also, should I try to find '05 models with the PRT chamois or the '06 models with the 3D chamois? Thanks!