Welcome to the forum. I happen to like the E-Series body size for every day carry, since it's thin and provides a usefully long run time.
One option would be to pick up a Surefire KX2C 200 lumen single output head assembly, with TIR optic. I actually searched for this exact head yesterday, and found them for $105 from a couple online stores. I bought an F04 difuser a couple weeks ago, and it makes the E2D LED's beam much more useful for close range work, yet removes easily for long range spotting.
If you're interested in dual output, the E2D LED's head will provide a 200 lumens high and 5 lumens low outputs when used with any E-Series body. Since this isn't sold as a separate upgrade part, it may be difficult to locate.
I recently bought a Valiant Concepts VME head to use with an E2L and like it a lot. Not only is it shorter than the KX2C, but it is usable with any Malkoff M60 or M61 drop-in, and probably those of other manufacturers also.
Grizz