Ram 2005 headlight bulbs

On the new to me 05 Ram 2500 CTD, I note a big difference in lighting compared to Old Faithful (97 Ram), but it's still not perfect. What type of bulb should I use while staying street legal? I've used Sylvania's zXe in the old truck, they are good but pricey. What about SylverStar Ultra?

rather then replacing bulbs try what I did to my 05 ... huge difference even with OEM bulbs. I tried the different aftermarket bulbs, they were just as bad. Then I changed the headlight wiring harnesses to heavier gauge wire(the light gauge wiring is ok for relays, but not for headlights)... check this out:

http://www.danielsternlighting.com/tech/relays/relays.html