DiNotte 140L with a backup PlanetBike should do the trick. Folks here say they are visible from a 1/2 mile but I'd say that range is closer to a mile. I've driven buses across the I-90 floating bridge for years and commute by bike across it. I have no problem picking out DiNotte taillights at the other end of the bridge which is over a mile in length, even in heavy rain.
I finally upgraded to the 140L myself. After comparing the 140L to my SuperFlash, I wonder why I waited so long.