I'm a big fan of using one "see stuff" light and one "be seen" light when riding at night.

I use a Knog Toad as my flashy be seen light. That pretty much lives on my handlebars all the time. Then when it's getting on towards actually being dark I put my Dinotte 200L on the handlebars. Amazing little light, expensive but worth it.

The Cygolite Dualcross is another excellent light and about $60 cheaper than the Dinotte.