You paid too much. I paid $98 for DDM 55 watt HID kit with slim ballast. They have lifetime warranty. You have none.
They sell Raptor kits for as low as $45 and they no different than any other kit out there.
6000K kit is ok depends what you after, looks or performance. Go higher in K value if you like blue/purple. Stay at 4300K if you after brightest set-up possible.
55 watt ballast will boost your output to 30-40% over 35 watt. These are REALLY bright but cheap kit bulbs get VERY hot from 55 watt and may melt your projectors/housing. Avoid using kit bulbs with 55 watt, go with Phillips 85122 or better yet DL-50 which is THE ONLY true 50 watt bulb