Question I7-2600k best system

Assuming you already have the i7-2600K, I'd go for a mobo with a Z77 chipset for overclocking potential. Something like a second hand Gigabyte GA-Z77-D3H.

https://forums.tomshardware.com/threads/best-lga-1155-motherboard.2579925/

https://hothardware.com/reviews/z77-motherboard-roundup-msi-asus-gigabyte-intel

The IMC (integrated Memory Controller) on the 2600K is specified to work up to DDR3-1333, but you might get faster DDR3-1600 to work if the mobo supports memory overclocking.
https://www.cpu-world.com/CPUs/Core_i7/Intel-Core i7-2600K CM8062300833908.html

Memory controller
The number of controllers: 1
Memory channels (per controller): 2
Memory channels (total): 2
Supported memory: DDR3-1066, DDR3-1333

Buy the board first, then check manufacturer's QVL (Qualified Vendor List) for recommended RAM. It probably doesn't matter if the RAM isn't on the list. Just make sure it's DDR3. Tighter timings (lower latency) are better.
 
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