If you game, you don't need 16GB alltho they are usefull. The 7700k and the 7600k should be the same in haming so my recommendation for gaming is the 7600k, 8GB of ram and using the money from the other 8GB stick for a 1060 6GB since that WILL make a difference, also, upgrading a gpu is hard because you have to sell your old gpu (and lose a lot of money there) and then get a new one where ram is "plug and play" plug it in and you are ready, should male for an easier upgrade.