As far as power (35w vs. 55w), I'm not sure how the aftermarket projectors will handle it. Obviously, the higher-powered version is going to be more light, but it is possible to over-whelm the projector bowl and just get a lot of glare, losing some of the cleaner looking cutoff. You're also going to have more light going up (the "squirrel finder"...might have been me that dubbed it that on this forum, but that's what they are called). If you are in heavy rain, fog, or snow, this will glare YOU with backscatter. Trust me on that. I've done it and experienced it. Still, if it was me, just getting a PnP kit, I'd go with 55w....lol. I have 35w in my retrofit, which is plenty of light because it's incredibly focused, but I am also tempted to get a cheap 55w Raptor kit just to see the difference, too.
I just ordered one of the Raptor V2 kits in 55w for my fogs, so that should be interesting. I may actually be able to tell the fogs are on when that's in place.