Any H1 kit off ebay for about £30 delivered will do, colour temp between 5-6k will keep it oem looking. Its not hard to fit and a few diy/pics showing location of ballast etc on here.
High output halogen will have a shorter life because they burn hotter, the bulbs blowing can be a electrical inbalance, alot of cars have similar problems such as one bulb going etc. But I wouldn't expect both going at the same time. always make sure you dont hold the glass and the bulb is seated correctly, they have a slant cut on the base you need to line that up the right way round, and if the springs dont go back properly, or its not seated the vibration from bumps can quickly end the life of a bulb.