So ive recently bought a new hi def tv and figured i would go out and buy a HDMI cable for my xbox 360 when i went to futureshop i saw the official microsoft HDMI cable for $50 and just a regular one for like $20 so is it worth it spending the extra money for the "official" HDMI cable?

Hey so i just bought a playstation 3 and the only table i have to put it on already has some consoles on it, so im wondering can i just put it on top of the box it came in or will that overheat the console when it's turned on.?