The big problem of running one hyper-bright taillight is that they almost always put out a pinpoint of light, especially at any distance. Multiple bike lights placed above and below on a seatpost or side by side on a rear rack but so close that they will not be seen as a distant car seems best. Remember cars have many many square inches of tail light and that is what other car drivers expect. The best lights I can think of would be a Shimano or Schmidt dynohub, Busch & Muller Cyo headlight, and a Busch & Muller Line tech plus taillight. Augment this with Planet Bike Superflash 65 (daytime visible). Never had a B&M light fail, don't think you'd need an extra headlight.