http://www.ddmtuning.com/Product-Cat...hting/HID-Kits
that site above has full kits ^^^^^^
thats who i use for all of my vehicles...they are very reasonably priced and have GREAT warranty and customer service!!!
i purchase the lifetime warranty versions every time... definately work the extra $30 or whatever...i had one of my ballasts go out one time, called em... they sent me a whole new kit (2 ballasts and bulbs)...with no questions asked.
also- they do packages if you purchase like 3 or more kits at a time. so talk to each other and order em together.
differences-
35w ballast- most basic charging system, works fine but your lights wont be as bright (maybe a 20% improvement in light)
55w ballast- $10 more, and worth it in my opinion (this is the main difference between a good set and a crappy set) (maybe a 50% improvement)
H4 bulb- standard VX bulb
9003-VX sized bulb without the hi/lo abilities (cost is much less)
- and after many HID conversions on various vehicles, i refuse to order the H4's, i prefer to save the ($20-30) and buy some aftermarket driving lights... for some reason the high beams on the HID conversions just arent enough.. but a cheap set of Hella's ($60 at walmart) and they will definately light up the night when needed.
bulb color-
3000k- yellow
4500-10,000k - tints of blue and white (4500 being most blue and 10,000 is white)
12,000k - purple that you often see on acura's and older lexus'
this is all info that i've accumulated over the years and from personal experience.
the kits off this site are right around $100 for all the bells and whistles, and can get as low as $50 for a complete kit.