Haven't bought the one for the truck yet but:
www.hid-online.com
and
www.xenondepot.com
both have PHENOMENAL equipment. Phillips bulbs + ballasts are the ONLY way to go. (OK, Hella ballasts too)
There is a company I know that will do a TRUE retrofit with lenses for $850, but you need to send them your headlights...still it is awesome.