what they should do is build the xbox360 case with some filters that keep the dust away from the insides. You should see how much dust accumulates in the heat sinks and fans, just like in a PC. We do dust and run air purifiers in our house, but you can't keep all the dust away from it.
Is it worth it to buy the Xbox Elite version just to get it in black and get a 120GB Hard Drive? They say the hard drive costs $179, I don't really download any movies and usually delete most of the demos after trying them out, so I don't need it. I guess if I really have to buy a new one (I think I will last only a week without one), I will have to deal with it being white and slap my Halo3 face plate on and my original 20GB hard drive that still works with my profile and all my achievements, games, demos and account settings.
Looking up prices at best buy:
Arcade $279
Premiium $349
Elite $449
At least I'll get those 6 classic Arcade games I've played millions of times before....like Pacman