The Prometheus Lights Beta QR is an excellent choice(2 mode or if copper, 3 mode) because of the quick release to take it off the keyring(when the valet parks the car), or the optional clip if you prefer shirt pocket carry. I have also always been a fan of the Four Sevens Preon P1(or P2 if you prefer longer runtimes). The new Preon MKIII is about due(I preordered 3). Honorable mention to the Olight I3T in Copper-it is by far the largest of the Lights I mention, but if you prefer pocket carry over keyring the beefier size/weight make it easy to handle...Unrelated to the OP, but relevant, I suggest NIMH rechargeable cells no matter what light you choose-no leakage, save money and in my humble opinion it extends the life of "most" lights.....