If going to HID and wanting the highest light output, I'd go with HID Projectors. If you are going to spend the money on HID headlights, might aswell get the most light output as possible. But I guess this depends on if you want to go all the way or not.
I know alot of people on here are mentioning DDM Tuning, but I have done ALOT of research lately on HID's. I'd personally go with The Retrofit Source. They do cost a bit more, but you get what you pay for. Their Customer Service, Quality and Options are TOP NOTCH! Oh yeah, don't forget the warranty! It's a 5 year warranty! DDM's "Lifetime" warranty has so many conditions. They only replace your product if it has defects among many other conditions.
I have researched the best brands and company to get them from and The Retrofit Source was hands down the best I found on the internet. I considered DDM Tuning, though, but with everything I mentioned above, TRS is the best.
In regards to HID's, our headlight housings are Halogen. Meaning that putting HID's in a Haolgen housing, doesn't get you the best light output. In order to get the best light output for what the HID's are meant for, you need Projectors. Check out this How-To link to do HID Projectors:
This gives you the true HID light output. It doesn't blind oncoming traffic as it has a light beam cutoff on your low-beams where it has a lower cut off towards the left side for oncoming traffic and projects it out so much farther than Halogen headlights and HID headlights in Halogen housings. I already purchased a kit from them for my Nissan Armada. I have the Morimoto 5Five 50w ballasts with the 6000k bulb.
Here is the Stage I Motorcycle Kit
Here is the Stage II Motorcycle Kit:
I am doing this as soon as I replace my clutch plates.
All of these pictures here are from a motorcycle except the 3rd & 4th picture