If you want to get the most benefit from HID lighting and not blind people, do a projector retrofit. Just sticking HIDs in your lights that are designed for halogen is gonna create excessive glare and excessive foreground light, making it harder for you to see in the distance. The best aftermarket ballasts is gonna be the Morimoto brand from The Retrofit Source. BuyHIDs is supposed to be reliable also and their bi-xenon bulbs "tilt" in the correct position rather than "telescope" in and out like most shitty aftermarket bulbs do. That's if you'd rather stick HIDs in your headlights and call it good. I used to have the DDM tuning bi-xenon kit where the bulbs "telescoped" in and out and they were terrible. I got high beamed and flashed at a lot and the high beam was a joke. All it did was turn a frowning "cutoff" into a smiling cutoff. So even though it lit up the trees on the side of the road, I got no light down the middle. Yeah, stupid design. Retrofit is the way to go if you want HIDs the right way.