I replaced my headlights with the silverstar ultra H13 in my 06 dodge. Real simple and I wanted to see the difference between them and the stock ones so I left one stock and one with the silver star and turned on the headlights. The silverstars produce more white light and added a little more visibility at night. The stock ones you could see the difference as they appeared yellow compared to the silverstars. I got mine at Autozone for about $40 for both. Here is some info on the HID headlights. http://www.oznium.com/hid
Look for best pricing on LED's but I found these LED's ones fairly cheap though.