Shutting of computer, what do you think?

Which as it is, kinda makes sense, but is pretty useless unless you put a time with it to convert back to energy. TBH, I'm not sure that my el-cheapo 300W PSU could handle 600-900W lol (although maybe I'm confusing the way the power os a PSU is calculated - god knows that take enough liberties with speaker powers!)

I agree. 600-900 watts does seem a little high. It might peak to that level or higher initially. Honestly, I don't know. But it does make more sense to use energy in this instance. The amount of power * the amount of time it takes the computer to power on. Of course, power isn't going to be constant during that time.

Generally, the rating on a power supply refers to the continuous power comsumption. They will be able to handle peaks exceeding that value for small amounts of time.

I leave my comp on 24/7 and haven't had problems. 1 downside to it, is that your RAM gets full of garbage and your computer slows down. Hopefully windows longhorn will have better memory managing tools built in so I don't have to restart once a week or so to keep by beast running at top speed.