Osram makes a pretty popular bulbs that can be using in place of the 85122 but the Philips is pretty much king. The projectors themselves make a difference in output.
You can use 45w ballasts but run the risk of burning your bowls. I make brackets to put LED projectors into ALL but the UK spec headlights(only because I've never torn one apart). I've replaced my 99 spec xenon's projector with a newer bi-xenon projector paired with the 85122. Looking to switch it again to go Bi-LED.