Another vote for Alpkit Gamma
Postives
Bright Light
Ouput designed for running rather than focussed just on distance. A pool of light rather than a spot in the distance.
Reliable
Light at front/battery at light gives good balance
Rear flashing unit
Slight Downside
It doesn't run on rechargeables due to being non-regulated output or something. So you have to buy real batteries. One of the new Petzl's is rechargeable and/or takes AAA normal/recharable batteries.
There is also a new lenser that seems to have had good reviews.