Despite the size difference between the two they do fit very much the same. It just comes down to how you look in the round and square lenses. Whether the rounder Warden may hit your cheek or not. I think adding the trigger stems to the Wardens were a plus.
Justin, if your OPD is a stretch dealer (with the black stretch tower) then he should have no problems getting the Warden for you. If not
http://oakley.com/o/o1118d