indeed, things i would change
X800XL - i would say a bare minimum of an X850XT here, preferalbly an x1800 or a geforce 7600 minimum.
Antec TruePower II 380watt PSU - you might want to consider one over 400 watts, altho 380 "might" be enough, its kinda pushing it a bit, id recommend being more towards 450-500watts
oh and nobody answered your questions
Oh and one question. Standby
Does anything got hot? Can it hurt my PC?
Nope infact quiet the opposite, things go into power saving mode, it all runs cooler, infact i think on a proper PC it turns it off and pages the current memory do disc, but this is made more for laptops.
It sucks power. What happens if I turn it off at the plug?
Well, some motherboards dont save the bios settings correctly, but it shouldnt be a problem, but the amount of power it uses when off is neglegable, id leave it on
How does it work anyway?
ive said above all i know about standby :P
__________________
http://www.generalemu.net/
Intel Core 2 Quad Q6600 @ 3.4Ghz (425x8), Leadtek GTX 280 1Gb, 1.8Tb HDs, 2Gb Corsair DDR2-800 @ DDR2-1020 5-5-5-18 Dual Channel
Dont PM me for help, use the forums, thats what its for!