Tacyon: There's really more to it than the wattage. Wattage makes the light more intense but it's the amount of lumens that actually determines how bright your lights will be.
Stock HIDs are generally 4000-4150K in color which is usually somewhere around 2500-2800 lumens. My 5000K kit is 3200 lumens. My previous 6000K kit was 2800. Bear in mind, my kit is 35w.
Here's a color chart to better clarify things courtesy of the vendor I bought my kit from.
http://shop.3bspecia...B4-Kits_c34.htm
As for the audio system, I do agree it does need more wattage in the cottage. However, I would like to change the amplification and the speakers.