Can my PSU handle all the extra stuff I'm want to add?

[sd11]

The PC in question is the one in my sig. I'm planning on adding another 3 HDD's, ageia physx card, and using the third PCIE-x16 slot for a third nvidia card for physics (probably single slot 8600gt).

So far the PSU works like a champ, is this going to push it a bit to far?