IF you're going with a non-K CPU, then the option I'd recommend is the AsRock H270M-ITX/ac
for $90 after MIR which has niceties like built-in WiFi, and M.2 port. I think it has a nice layout and since you don't get all the stuff like CPU/RAM overclocking, the price tag is low so you can afford the high cost of RAM. This 2400MHz kit for $210
would be a nice match with heatsinks that are barely any taller than the PCB.
If it's something a little more luxurious you're looking for, the MSI Z270I Pro Carbon
is on sale for $135 after MIR. That gives you the ability to use >2400MHz RAM, and adds a USB Type C port as well as RGB lighting. I'm not excited about all the fan headers located behind the IO panel, and the M.2 slot is on the back of the board (this seems to be typical of the more feature-rich Z270 boards with VRM&chipset heatsinks though) but that's a small trade-off, if any.
Main: i5-3570K, ASRock Z77 Pro4-M, MSI RX480 8G, 500GB Crucial BX100, 2 TB Samsung EcoGreen F4, 16GB 1600MHz G.Skill @1.25V, EVGA 550-G2, Silverstone PS07B
HTPC: A8-5600K, MSI FM2-A75IA-E53, 4TB Seagate SSHD, 8GB 1866MHz G.Skill, Crosley D-25 Case Mod