The D1S Osram Xenarc 66144 CBI is going to be your brightest direct fit bulb. At 5500k it is decidedly cooler in color temperature than the factory 4300/4500k but is by no means blue.
Xenon bulbs do not have a wattage rating, ballasts do. All Xenon bulbs can operate at a higher driven wattage, but it shortens lifespan in doing so. There are no aftermarket ballast options for our cars with increased wattage output.
Buy from The Retrofit Source if you want to be sure you are buying genuine bulbs and not Chinese fakes.