Tirerack tested the AD08, RE-11, Ecsta XS, and Star Spec:
http://www.tirerack.com/tires/tests/chartDisplay.jsp?ttid=118
Dry lap times: 1. AD08 2. Star Spec 3. Ecsta XS 4. RE-11
Wet lap times: 1. RE-11 2. AD08 3. Star Spec (all tied with margin of error) 4. Ecsta XS
My pick, the AD08.