Would need a budget to recommend anything. Also need to know what resolution and framerate you want. I'm guessing 240fps for csgo? Then any parts you're keeping, or if you just need cpu/ram/mobo?
Anywho the 7700k isn't current any more, you're looking at (intel wise anyway) the 10700k, but you'd be mad to go intel unless it's really the only thing you do, but if you're using blender AMD is going to shit on intel for renders and stuff.
The long and the short of it is the ryzen 3600 will probably equal the 10700k in blender, and it's like half the price.
EK Custom loops can start you at around 300-350, or their prebuilts can go up to 400+.
Like darkey said your best bet is i7 5820k and gtx 1080/1070.
PSU: Evga 650w G2
Mobo: Whatever has the features you want and overclocks well.
Ram: At least 16gb, though from my shoddy memory x99 goes by 6gb multiples.
I'd get a large budget ssd like an ocz trion 960gb because they're cheap as fuck and still faster than a platter drive, and something like an 850 pro for boot/OS.
Does your budget allow for monitor/peripherals OP?
Get yourself a xonar card and completely disable onboard sound in bios
I'm pretty sure every maximus 8 board has an ess 9023 DAC and texas instruments op amp. Its basically already as good as a xonar. You would only need to upgrade to an essence or external dac/amp if there's electrical noise/popping etc.