I just ordered my HIDs and LEDs from Armaden. I had DDM HIDs in my last truck, but their customer service SUCKS. Armaden took time out of his Saturday night to return my emails and answer all my questions and shipped mine out with an ETA of Wednesday. My ddm stuff kits took 2 months to come in. Time is money!
Armaden (here on TT) and HIDExtra.com are the 2 most popular choices for HID kits. I myself went the HIDExtra.com route only because they had a Christmas 2-for-$70 deal so I went ahead got the fogs and lows.