hardware power usage

im looking at an htpc case for a mythbox, and i was wondering if the included 240watt power supply wouldbe enough. my plan is to use an AGP graphics card (GeForce 5 series), two PCI capture cards, Athlon XP CPU, a DVD burner, and two SATA harddrives.

Does anyone know of a good resource for power usage by part? so far my googling has been unsucessful.

or, if anyone has an estimate of how much power this thing will suck, id appreciate it

thanks

Well, I solved my problem, Ill need about 200 watts

for those interested, i found a handy tool here: http://www.jscustompcs.com/power_supply/