Zebralights of course. Buy one and forget all others ;) I have a Ultrafire H3B 18650 light and it really is dim and useless next to a Zebralight H51.
Are we all going CPFized? One day will come and we'll even see people saying SolarForce's are cheap fakes of marvelous SureFire's. Look at me, I started using SureFire CR123s and have a G2 Nitrolon already :)