Over at batteryjunction Matt's got some of the seoul ones left, which are apparently better, as it works better with the reflector. The downfall of them though, is that they run a bit warmer and like to be heatsinked via a washer between the body and the module, which requires taking the little black plastic thing out that says "DO NOT REMOVE" and sticking a washer in there. This makes the twisty "switch" non-functioning and requires a tailcap switch, which i would reccommend getting the kroll switch from the sandwich shoppe. I'd always get a tailswitch, even if you stuck with the cree one and didnt 'sink it because they are nice to have.
The only other things that I can think of are glass lens and a strike bezel.