Wey-ull . . . . There's plenty of time for some more research.
But here's a budget for a Z170 system project:
i7-6700K $350.00
Sabertooth Z170 Mark 1 $ 210.00
G.SKILL RipJaws V 32GB $170.00
Corsair Vengeance C70 $110.00
Corsair H115i $110.00
Assorted PWM fans $ 115.00
Seasonic PSU 650W Gold $110.00
Windows 10 Pro OEM $130.00
ADATA SP550 960GB SSD $200.00
TOTAL: $1,505.00
Frankly, I don't need to pull the string on all of it to start testing and tweaking. I have a spare Noctua NH-U12P cooler and socket-115x kit. As much as I hate 'em now, I have several Sharkoon 140mm 3-pin fans in storage, and some 120x38mm 3-pin Panaflo's. But my spare SSDs of any useful size are already destined for my server project -- or one of them.
I could trim the RipJaws V to 16GB which would be only about $70. But it would make more sense to spring for the 2x16GB kit right away, instead of filling all four slots over a period of time.
As for the graphics card, I can wait, and use the iGPU instead while I get familiar with the board, CPU, UEFI-BIOS, and a range of OC's.
If I take my time, some of these choices might change, and so might the numbers.
[RETURNING after a little game-play:] I still . . . really, really, really like these old Sandy Bridge systems.