you won't need to upgrade the wiring with HIDs as they only draw 35w much less than standard Halogen globes. You will be blown away with how bright they are. Everyone that sees my car at night pretty well goes out and buys a set of HID's.
With all 6 HID's on going down the high way, I can't read speed limits, the white of the signs reflects so much that it drowns out the numbers.
Whether or not this is a consideration for you, I don't think the bi-xenon kits are legal, but I have never had a problem. Been pulled over a few times and it has never been mentioned.

