DDM Tuning sells good stuff. I have a set of their HIDs and love 'em.
35w is all you'll need. 35w HIDs are many times brigher than your stock halogens. 55w HIDs are just total overkill unless you're using them in an auxiliary lighting capacity.
When it comes to color temperature, the whiter the better. OEM HIDs are all around 4300K, so keep that in mind when choosing. The higher the Kelvin (K) temperature, the bluer the light. The bluer the light, the less useable light you get from them. When you get into the 8000K+ temps, you're also getting so blue that you'll be looking a possible legal issues too.
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I would also recommend the relay harness for your truck. DDM calls it the "dual in/dual out harness."
I would also suggest a hi-4 relay as well.