The Temple, Mason, Buddha, Stonehenge, and Coo TS RDA's are nice...you do need to build to fill the chamber more or really cut the airflow down since there is much more chamber space.
Use 4mm Coils and many wraps but use Multiple Cores to keep the resistance down....you will need a long coil for the Temple unless you stretch you leads and bend them.
I dont have a favorite 30mm yet as they all fee like they could use improvment but I do like the Mason, Temple, Coo TS and Stonehenge RDA's.
Im actually trying to get Pete Haddock to make the Shuriken RDA in 30mm size right now.....Imagine a Goon RDA in 30mm!!!