Lights like the P1D CE and D-Mini seem to be running the emitter fairly close to maximum. And assuming their reflector/lens loss is reasonable, this means the only way you'll get more throw is to focus the beam more tightly. As far as I know, that means a bigger reflector or maybe a lens. So basically if you want the most throw you should be looking for the light with the biggest reflector. Personally, I hit a point where the light is too tightly focused to be very useful. The D-Mini is just about at that point -- it's ok, but I wouldn't want anything narrower. So that's as much throw as I'm going to get until the next generation of higher efficiency LEDs appears.
c_c