The 03-05 has a reflector housing for the low beam, this requires the retrofit of a projector lamp housing.
The 06-09 has a halogen projector housing for the low beam, you can install an HID kit with only minor modification. do a search for "Squirrel Finder" or "Squirrel Spotter".
(Note: it wont be as effective as a projector housing DESIGNED for hid, but its cheaper, and is VERY functional.)
Edit*
As for a recommendation, get Morrimoto's from
http://www.theretrofitsource.com/, 4300-5000k 35W.
you can also do the fog lights, they are reflector housings, but as they are low on the truck, if you aim them down a bit you can get away with it.