Hassan_91 :
By the looks of it the 7800 looks almost on par gaming wise with the 7700K
The problem (I) find with the 7800 lies with the coffee lake launch. If you can wait, you would essentially get the same number of cores/threads on what SHOULD be a cheaper platform. Same deal with 7740/7700 and 7640/7600. Granted they clock ever-so-slightly-higher, you will still be paying for a more expensive mobo and ram. Not worth it, IMO. 7820 and 7900 are the ones that stand out, but they have their own set of problems, i.e., 7900 is a space heater, 7820 isn't quite as bad, but consider the cheaper ryzen alternative - but you're not interested in what AMD offers...
7700, 7820, and CFL are the more reasonable choices, IMO.