The best lights? ...any advice?

I usually ride early in the morning (3:45 or 4:15 start) so most of my riding is in the dark (2.5 to 3 hours per ride).

The routes I take (roads and bike paths) are relatively consistent and some parts of them are quite well lit ..... others sections are very dark and I've had a couple of spills primarily due to not being able to see debris on the path until too late.

As a result of my latest spill (three of us hit a tree that fell across the path) I've decided to invest in a good set of lights. One friend has recommended the "Ayup" range (an Australian brand) http://www.ayup.com.au and they certainly look good according to their web site.

Would others like to share their experiences with lights?