There's a significant difference between the G2 and the C2.
If you want a basic light, then the G2 is the one. The C2 has a clip and the combatlight body. If you're not interested in use with a handgun, then the combatlight body is less important. If you just want the clip, then the D2 or the E2 are less expensive choices. Assuming that you don't need the combatlight body, the E2 is really easy to carry either in a pocket or using the clip. That's my preference. If I get an M2, then my favorite carry light may change, but until then, the E2 is chosen over the 6P and the Scorpion.
gm