I personally have an Xtreme HID kit 4300k from hiddepot but i was looking around for hid's on the forums for my friend. The most common ones that come up are MobileHID and i was also looking at Operatic's HID kit for 130.

Set aside the prices of the two i would like people's opinions on which they'd rather purchase or share some personal experience with the two. Most likely will be purchasing 4300k