I have a Cygolite setup... Hotshot - Rear, Expilion 600 (internal battery) - Front. I love these lights. I don't encounter many other riders in my area who are riding brighter... (unless it's a true roadie with a gang of individual blinkies/lights, looking like a space ship that's landed & is riding down the street. lol) Most don't even come close to the brightness & look at me with those 'hater' eyes. HA!
I also like the Cree XLM T6 (external battery) & the Serfas USL-TL60 Tailight. (both are BRIIIGHT!)