So as far as keeping you up to date frag, power supplies today have the exact same interworkings as they used to, they only make them capable of providing more converted power. Also, as far as i've been able to research, NONE of them have any more of a failsafe than another. (I did read an article about a research team devloping a powersupply with a breaker switch that would flip before anything blew)
The more expensive PSU's are usually quieter, have better cooling, modulated cords, and could have more capasitors to control your houses power fluxuations when you turn on other power heavy devices (Eg. Vaccuume cleaner), without sufficiant capasitor storage you could get a reboot when one of those other devices turn on. - You can fix this problem with a UPS
On a side note...BIG screen TV's and projectors have had 1,000+ watt power supplies since before I was born. And alot of them are still alive and kicking!(just checked ebay) Now that they morphed into a PSU shaped box with a few diffrent wire configs it costs nearly $300. You'd think they would come down in price dramaticly It's still the same AC to DC converter it's been for 30+ years I guess thats the price we have to pay for the fabracation.
