V-Leds has one of the best quality products on the market
V-LEDS.COM | LED Dome, Map, License Plate, Reverse, DRL, Turn Signal, Brake Lights
they have the switchback led's which are pretty cool, their white all the time but blink yellow when u turn on the blinker. They also have normal LED replacements. Regarding mine, I always make my own bulbs with the brightest emmiters available. On my infiniti I put 6 3Watt LED's for example.