I agree with those people saying one of your Tagans will be plenty for your system.
My Seasonic S12 430w runs my 8800GT, Oc'd Core2, 2 HD's, WC gear, 6 x 120mm fans and all the other bits in a normal pc no problems at all.
I did check power draw with a wall meter, and never saw over 220w, although how reliable those things are I don't know!
It's always best to have a bit of power in reserve I think though, if only to ensure the PSU stays coolish and the fan never speeds up, but for many people these new 800 and 1000w PSU's are overkill indeed!
My Seasonic S12 430w runs my 8800GT, Oc'd Core2, 2 HD's, WC gear, 6 x 120mm fans and all the other bits in a normal pc no problems at all.
I did check power draw with a wall meter, and never saw over 220w, although how reliable those things are I don't know!
It's always best to have a bit of power in reserve I think though, if only to ensure the PSU stays coolish and the fan never speeds up, but for many people these new 800 and 1000w PSU's are overkill indeed!