I have a set of Blackburn X8's. One light is a spotlight and the other is a flood. I point the spotlight out ways and let the flood fill in the space out to the spotlight. They also come with a dimmer switch which I use to avoid blinding peds and fellow bikers.

http://www.amazon.com/Blackburn-Syst.../dp/B000WNNAU2

I've seen them for pretty cheap around the net. I got my set brand new for just over $100 online but I don't recall where. The place would liquidate inventory for biz's that had gone out of biz.