I wanna build a htpc using an old pentium 4 socket 478 proccessor. However the motherboard for it is useless meaning i'll need a new one which i can get for 35 quid. However i'll then need an agp card which will create more heat. So instead i;m thinking of buying a socket 775 motherboard and a cheap cpu. I have seen 3ghz celerons for 25 quid or or a dual core e1200 for 35. All i wanna know is, is it worth paying the extra tenner for two cores at a lower speed or goin for the i core at 3ghz. The system will only be for dvd and tv playback running vista media center. What do you think...