I haven't dealt with hid kits store, but Amazon has the two-pack for just under $90 shipped:

http://www.amazon.com/gp/aw/d/B00C31...pi=SL500_SS115

Curious. Most retailers that I've found online who sell the D4S bulbs, have a choice of the 4300K (OEM Temp bulb) and the 6000K (Cool White). I was wondering what people's preference was.

I've designed a lot of home theaters as well as lighting for movie sets. Light temperature is something I'm familiar with. Normal daylight, around noon, depending on the sky, is rated right at about 6500K (Kelvin). This is what most consider (Natural Light). The 6000K is the temperature of many of the "Annoying" white headlights we've seen coming down the highway towards us at night. Of course we don't have to see our headlight. We use the light to see whats in front of us.

So, do most here prefer the OEM 4300K light, or when you need a replacement, do you change out and buy the 6000K (Whiter)?

A couple comments on the color/temperature of the HID lights: typically as the temp goes up the light output goes down, so the more Kelvins there are rated for - the less it will illuminate. I usually stick to 4300-5000K for that reason...

As for the other drivers who blind you on the hwy with their HIDs, that is mostly because they just put HID bulbs in their OEM halogen-bulb headlights without projector lenses without any control of the output coverage (cut line), not too much to do with color or K-rating ;)

Excellent observation. I've definitely noticed the "Whiter" of the HID's, but I never considered that individuals were simply taking HID bulbs and swapping them in for their traditional Halogens. That would definitely make sense.