I'd get the E2 if you're planning on really using it very much. The E1 is very compact and a great little pocket light that produces good light output...but the darn thing heats up very quickly. There's such a little area that you can hold...when your hand moves forward...it'll get warm. The E2 really isn't that much bigger (just longer) but still fits nicely in a pocket or pack. It'll give you a little more handle to hold with more light output to boot. <br><br>The surefire 6P is another option...it's a little bigger, but not by much. <br><br>Kev