Like defloyd77, I wonder what generation E1L you have. Is it one of the older ones (Luxeon emitter, 20ish lumens, squarish beam), or one of the newer ones (Cree emitter, 45 lumens max, nice round beam)?
Well, either way, there are numerous options. The E1B is indeed one option, with a much brighter high mode, and lots of runtime on its low mode. Although a little longer, I personally favor the L1, which has the same beam pattern as the E1B and newer E1L, but rather than a clicky tailcap and interface, it has a two-stage momentary/twisty tailcap (I prefer this because pressing/twisting to your desired level of brightness seems more intuitive than clicking through to it, as in the E1B/E1L).
That's about it for SureFire lights, but you've also got LOTS of non-SureFire options. If you need something as good as or better than the SureFire in terms of reliability, durability, warranty, etc., then I would just stick to choosing between the E1L, E1B and L1. However, if you want a light that is "better" in terms of other things like brightness, different modes/levels of light, size, etc., then there are a few I can suggest.
The NiteCore D10 (or EX-10, for that matter, if you prefer CR123 batteries) will give you a light almost as bright as the E1B/L1 on its highest level, but will give you a lower low, and lets you choose any level of light in between. It also lets you operate it as a momentary twisty, or as a clicky, as you prefer. Take a gander around the boards here, and you should find lots of information.
Other alternatives (that I don't have personal experience with) would be the Fenix P2D, Lumapower Incendio, Novatac 120... I know there are others, but that's all that comes to mind at the moment.
In the end, my top recommendations would be the D10 for its superior flexibility in operation/brightness over the competition, and the L1 and E1B for their great durability, reliability and performance, even though they may be a bit bigger than their competition. (I should also note that if I had to pick one and only one light to live with for the rest of time, it'd very likely be the L1.)