I've put mine into a 2C cell Brinkmann Legend. That particular flashlight holds some special sentimental value, plus I consider the C cell Legends superior to the C cell Maglites. Unfortunately the C cell Legends are available hardly anywhere other than directly from Brinkmann.
The way to judge a good light for it is to view in the same way as an incandescent. A light that performs well with an incandescent will likely do well with the EverLED. A faceted reflector will make a more pleasing beam, while one you can focus will give you more throw.