Fuck those kits....heres what you do:
Get some 1000, & 2000 grit sandpaper, clear coat(canned), & compound. All this shit can be found at your local autoparts store. Wetsand (soap/water) the lenses with the 1000 grit for usually about 10min. You can do this under the facet, or in a big bucket. dry them off. They will be clear, then turn hazy. Repeat with the 2000 grit. Dry them, then clear coat them evenly, and let that dry.
Wetsand the clear with the 2000 grit, and you can do this as many times as you want. DONT sand hard at this point. Let the clear coat dry a final time.
Take your compound(I usually use Meguires), and rub a generous amount on the lenses. Once it dries, buff them with a good amount of pressure. They will look brand new. Takes about 3-4 hours, so do it on a lazy Saturday, when you aint going nowhere.
Mine looked the same, and they are back to factory. This shit is mad easy, and is not as hard as it sounds.
AS far as the HIDs, 4300k is what BMWs, Benzes, etc. come stock with. 4300k is 4-5 brighter than halogens. The further you go up in Kelvin (5k, 6k, 8k, 12k) the bluer they become, but they also put out less light. 12k is more like purple, and the boys WILL fuck with you at some point with those.
I chose 6k because it puts out a shit ton of light, and has a slight mix of blue with mostly white. My lights are blue in the pic cause I had just turned the whip on didnt let them warm up.