if you seriously want to run at night, meaning more than just an hour or less, then 2 lights is the way to go. I run ultras, and during the night section I run with 2 lights, a 50 Lumen headlamp, and a small 80 Lumen flashlight in one hand (with a keeper strap around the wrist).
2 lights coming from 2 differnt angles gives you better depth perception as well as simply more light.
any headlamp that you like with at least 45-50 Lumens, I have a Petzl Tika and a BD Spot.
and any lightweight flashlight that you prefer, mine is a small Coleman from Walmart.
neither of mine is regulated, that kind of scares me, because don't they just go out completely when they hit "that" point? I prefer the warning of the slow fade out, just carry extra batteries if needed.