That seems like a fairly ignorant statement to make. If you are looking for a future proof card it's going to cost you and I don't mean the allowance your wittle parents pay you, it's gonna cost big boy money. As far as a well performing card for current games at less of a cost a GTX 1080 will be fine. Ok, so, you want to talk about the future. Right now the best card you can get short of purchasing a Titan Z is the GTX Titan X Pascal. Then in January-February the GTX 1080ti is coming out and if you have one of those there isn't anything you will have trouble with graphics wise for that time. So really it makes it sound a lot more like you really don't know any of your stuff than anyone here. I hope that this response was more to your satisfaction. Three choices: Titan Z is the top, then Titan X Pascal, and then GTX 1080. Correct me if I'm wrong but when the 1080ti comes out, it will still not go over the top of the performance of a Z but like I said, that card costs big boy money.
Also, if you want performance reviews for each or any of these cards go to Amazon.com and look up each one, or go to Newegg. Or you could just request one here and not be an asshat, or, you could do a proficient amount of Google searching and apart from the 1080ti you should be able to find a Toms Hardware performance review for each of these cards...