I'm using an i-cute PSU, but I know they're not 100% reliable. I've got 2 out of 3 failing on me. Meh, I just like their casings.
As I said, I am currently using a 3 yo i-cute PSU. Unfortunately its been modded, with a bigger (read higher CFM) fan replacing the old one.
That should answer your first question. For your second:
On this PSU, I'm running:
P4 2.8
DVDRW
DVD ROM
120gb HDD
200gb HDD
x800xt
Audigy Platinum (with the front panel)
Tt Ufo (92mm CPU fan)
120mm fan (36cfm)
120mm fan (67cfm)
2 x 80mm fans (unknown cfm)
a whole host of LEDs that came with all fans cept the small 120mm (includes the UFO)
2 x neon lights on case.
1 x LCD on case (temp readout)
Its a 3 yo PSU, I don't think its 480W, think its only 450W. So your PSU should be able to handle plenty.
However, keep in mind I have changed the fan, it might have affected things, but its not a huge increase (50% more cfm?). This voids any warranty, and I must say is pretty dangerous, so don't do it if you have no idea what you're doing.