More than enough. I'm running my system on a 650w seasonic ssr-650rm with plenty of headroom.
http://pcpartpicker.com/p/1xhXY
This is roughly close to your build. It's estimated draw is just under 700w, but i doubt it'll actually draw as much as the estimate. You should be safe.
Well, the components will use all the Watts the power supply can give. If it isn't enough, it won't blow up, the components will be just not as powerful as they can be.