My motherboard cost more than my CPU, d'oh. It wasn't meant to, the plan had been Core i5-6600K and Gigabyte Z170 MX Gaming 5, but the 6600K was out of stock and I was told in November that it wouldn't be back in stock until January So I switched CPU to the cheap i3-6100 as a stop-gap, which has run KSP and Cities: Skylines great, but never reconsidered my motherboard choice. It's also more than my graphics card, because I'm still using the 750 Ti I had in my previous PC. Though I suppose cheap graphics cards aren't so unusual for KSPers.
And I don't like this board, the UEFI is a pain in the poophole and I had issues with it losing the settings (though that may have been PEBKAC). I don't think it ever got a look-in on the Skylake locked overclocking heydey either. Of course I couldn't have predicted any of that when I bought it.