I feel far safer at night than I do during the day. I feel pretty safe at all times, but it's not even possible to not see me at night.

I've historically ridden with cheap Chinese lights, and I have no real beef with them. They work very well, especially for the money (< $30).

I just picked up a Cygolite Metro 550 and I really, really like it. I have not ridden with it at night yet, but as a daylight strobe it is quite good, and at 550 lumens and with a diffuser light making the beam oval it's almost certainly a pretty good nighttime light as well. I won't really know for sure how good it is until I do a winter run-down test to see how many minutes I get at winter temps (10*F down to -20*F)

In the name brand arena, the Metro 550 is a lot of light for the money.