Well, I know that a Media PC doesn't have to be completely powerful, and I am not a gamer. The thing I need the high performance processor for is encoding videos to h264 for my iPod... normally it takes forever -_-'
I use this great program called iPodifier, and it will take any DVR file and convert it to high quality for your iPod...
I'm not all too concerned with energy usage/noise... those are the least of my worries
I do appreciate the suggestions to get an AMD processor... but I do have my heart set on one of the two that I suggested earlier. That way, I also have some le-way in regards to the processing power of the computer, should I ever come to need it for some CPU intensive task.