At $172 the price of the MSI Z170I GAMING PRO AC may be bigger than the actual board, as it is a mini-ITX motherboard.  As with many modern mini-ITX boards, the amount of features included is nothing short of amazing, apart from the single PCIe 16x slot which all boards of this size are limited to.  It does have a pair of DDR4 slots supporting up to 32GB, four SATA 6Gbps ports, a single SEx port and M.2 slot, five USB 3.0 and a half dozen USB 3.1 ports; connectivity includes wired, WiFi and even Bluetooth.  The overall design is quite attractive though the reviewers at [H]ard|OCP were not a fan of the overclocking ability nor the positioning of the M.2 slot on the rear of the board, see if those negatives outweigh the positives in their full review.

"The Z170I GAMING PRO AC motherboard is poised to be a tiny powerhouse for SFF builds or for those of you looking to focus on "less is more." If you are looking to make the jump to an Small Form Factor build, or you want to update an existing build you won’t want to miss this feature rich Mini-ITX motherboard. "

Here are some more Motherboard articles from around the web:

Motherboards