No problems there, mate! For your gaming stereotypes, a GTX 1070/1080 is for you, i agree. High graphics with every available setting set to max requires a lot of power, that's why you sometimes experience these fps dips even with high-end products, but let's admit the fact that the author of this topic plays at 1080p & high settings & has an i5-4460. Right there a GTX 1060 is a better option since it is "perfect" for 1080p and ultra settings (only keeping those AA settings not at max x16 etc) - can be found at every fps testing benchmark chart. Also, that i5 won't let a GTX 1070 achieve all of it's performance, because 1070 needs something stronger. Unless the author upgrades a CPU later or decides to get a bigger monitor, there is no need for 1070 :|
P.S. If you do have a lot of $$ and don't have plans on using them on other things, surely get a GTX 1070.