It's nice to see that the people trying to convince OP he needs to spend $500 to get a decent GPU are getting btfo. I've seen vgchartz convince people to buy macbook pros as pure gaming systems, so I always worry when I see threads like this.
A 1070 is more than enough. Even a 1060 will be absolutely fine. A low end i5 or even a high end i3 will be fine for your CPU. Logical increments has recommended parts for pretty much any budget you have, and there's a build there for a $754 system:
http://www.logicalincrements.com/