PSU for a whole whack of drives

[Yst]

So my current system, after a recent upgrade, is an

Athlon 64 2800+
on an Asus K8V

with things powered directly off the PSU being:

Radeon 9700 Pro
5 IDE HDs and 1 SATA HD
2 CDR/W Drives
1 5'1/4" bay SB Live! Drive
2 large (front and rear) case fans
1 small (side panel) case fan
2 blue case lights
1 floppy drive

and 5 or so USB devices at any given time.

It's been running off a 430W Enermax I had already, but not happily. I think this beast needs more power.

I could just go out and buy the most expensive Antec PSU I can find, but I'm wondering if I need to look for something specific when powering a system with 8 drives, a vid card with high power demands and the bunch of other random crap I have in there.

Being a bit of a noob when it comes to thinks electrical, I'm not sure how to check to make sure the PSU I'm buying has the amperage I need at the voltage my devices will be drawing, or how the PSU's current is divided amongst those various voltage levels.

Anyone have suggestions?

Thanks.

 

[tynopik]

add up the amps per rail (5v, 12v) for all the drives and other stuff and then make sure your PS can supply the required amps to each line