What Solarstarshines said
The 570 will chew up most games out ATM at 1080P resolutions.
So at 1680x1050, it may actually be a bit more than you need. But if you ever decide to get a higher resolution display, it will be up to the task.
As far as the PSU, what bothers me is the fact they are not outright with specs. Such as the Amps it has on the 12V rail.
Or at least, I couldn't find those specs. Only that it was 800W.
When it comes to PSUs, the wattage itself is not nearly as important as effeciency and the 12V rail amps.
I would recommend to sticking with one of the more reputable brands as mentioned previously.
A 650W or so of one of these will be plenty.
If I had to guess, I would say a 650W Antec, Corsair, or Seasonic would be significantly more powerful, cooler, & energy effecient than the 800W EZcool PSU.
I could be wrong, but just my thoughts for what its worth.
I wouldn't trust something like that to run my system plus a $300+ GPU.
But thats just me.