I woudn't replace the high beams. Colored bulbs aren't any brighter, and while the more "white light" does great on dry lighter colored roads, they make wet dark roads harder to see. The more yellow light in the stock bulbs give more visibility in those conditions. At least that's been my experience. I'd leave the high beams stock. You get the colored bulbs for esthetics, when you are using the high beams it's cause you gotta see, not be seen.

And yes, do the 9005 conversion for your low beams. If you don't know what that is, search, there's lots of threads on it.