<A HREF="http://www.pcpowerandcooling.com/" target="_new">Pcpowerandcooling</A> have a list somewhere on their site with the wattage that each component pulls. You could add up all your wattages using that list and then decide for yourself. Most recommend only using 70% of your powersupply for optimal performance.
<font color=red>Yeah, I took a crap on your lawn. Whatcha gonna do about it?</font color=red>