You should begin, IMO, by converting your existing headlights to the halogen-insert 'euro' style -- Hella makes a kit, been discussed here, or LMC sells one (though IIRC they get more for it.)
I'm pretty sure your truck has been rewired, as I remember relays by the lights, which is key for such upgrades.
Past that, I'm partial to the Hella 500's, myself; not expensive, but add a considerable amount of light. The 550 is a similar light but in the rectangular style if you prefer that to the round.
I've had no problems with the plastic housings, either durability or thermal issues.
I have trucks with both and you're welcome to swing by sometime to see 'em, if you wanna brave the neighborhood in the dark
-- A