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Depends what you're doing, a 5820k for gaming is pretty bad value.
6700k/ z170 leaves you with no likely meaningful upgrade route though.
this thread is a joke right? 5820k is terrible value for money. best bang for buck is a non-k Skylake eg 6400, in a board with a bios that can oc non-k.
talking about best bang for the buck I still believe the G3258 is still the one. However, best bang for the buck doesn't mean that it has to be able to run everything smoothly.
Except they didn't stamp it out - you just need the right bios to enable it, and then you can disable microcode updates in Windows. k is £60 more. £60 can buy a motherboard. this is about bang for buck.