If you feel the need to have a nuclear reactor in your gaming case, the 2000W ATX Power Supply from Ultra Products should be enough for you. Being unveiled at CES, the 2000W PS is modular, and feeds up to 1800W on the 12V connection alone.
With all that power, you're going to be able to support quad core, quad GPU cards, or a gigantic RAID system to store all your homemade movies. No word on price, but we're guessing somewhere around the PlayStation 3's price tag.
Product Site [Ultra Products]