It is impossible to future proof, unless you're going to be doing literally the same thing for ever. If you plan on playing the latest games at the max res, then it won't be future proofed at all.
That does not mean that it won't do good now, but it won't do as good for new games at the same settings.
Get the 570. It's better for lower resolutions. They are about equal in performance, but the 570 costs less. Choice is obvious, isn't it.