Recently bought a Mity Cross light by Cygolite. I'm very satisfied. It has all the modes I need (high, med, low solid beam, flashing, SOS), and it lights my way very well. (I ride through a totally dark road with no lights at all, and high-speed traffic.)

When I was just riding across town on semi-lit roads, I was fine with a small solid beam and a Planet Bike front light, just to be visible.

I have at least two or three rear lights for some reason.