Looking to improve my visibility in the Titan at night, I installed Sylvania Silverstar 9006ST bulbs to replace the OEM low beam headlights.  These bulbs were well reviewed on TitanTalk.com and were highly recommended as a low cost alternative to true HID headlights.  The Silverstars do not seems to be brighter in respect to the number of Lumens produced, but they provide a much whiter light which enhances visibility at night on wet or dry streets.  When viewing the Silverstars from the front, the lights have a much clearer color to them and have a silvery white look to them instead of the yellowish look of the OEM bulbs.  I really believe that these bulbs enhance the way the truck looks with the headlights on from inside and outside the vehicle.

Close-up of the Silverstar 9006ST: