Best Skylake motherboard for a non-overclocking gaming i5 build?

Bad actor and I are on a similar train of thought, throw in a non-overclocking cpu (so you can't "accidentally" overclock. We differ because I say stick with the Z170 mobo anyway (*better upgrade potential. If you ever decide to 2-way SLI the H170's can't do that), and an I5-6400 beats the 6500.
http://cpuboss.com/cpus/Intel-Core-i5-6500-vs-Intel-Core-i5-6400

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-6400 2.7GHz Quad-Core Processor ($179.99 @ SuperBiiz)
CPU Cooler: CRYORIG H7 49.0 CFM CPU Cooler ($34.50)
Motherboard: Gigabyte Gigabyte GA-Z170X-UD3 ATX LGA1151 Motherboard ($112.98 @ Newegg)
Memory: Mushkin Blackline 16GB (2 x 8GB) DDR4-2400 Memory ($56.98 @ Newegg)
Video Card: EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card ($289.99 @ Newegg)
Total: $674.44
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-05-28 13:36 EDT-0400

Hi,
I've recently gone through building a PC to pretty much the same specs as you describe/require. I went with i5-6500 as I really feel no need to join the OC train. The chipset selection is then more less dependent on whether you want to have a SLI possibility open for the future. I have always had problems getting SLI configurations reunning optimally - the top cards overheat, sometimes it produces graphics artifacts, sometimes the screen freezes altogether (only happens to me with SLI ). Single GPU setups are generally much easier to configure and straightforward.
As for other Z vs H features, the H170 does have RAID, so no loss there. For the amount of USB and SATA ports, that again depends entirely on your personal needs. I am using Asrock's H170m pro4 board and it does have 6 USB 3.0 ports in the back and can handle two additional front USB 3.0 ports and two additonal 2.0 ports. It has 6 SATA ports, which is more than enough for me.
As for faster RAM, yes, the Z170 can run faster ram, but it is really not noticeable for a regular user. Unless you are planning to use the integrated GPU or have some special RAM extensive application in mind, 2133 and 2400 will run just the same to you.

Here is my i5 non-overclocking setup with single GPU. The CPU cooler is pretty much equal to CM EVO 212 and it keeps the CPU just 3 degrees above room temps when idle and I haven't yet been able to pull it over 50°C under load. I know it is mATX, compared to what you are looking for, but Asrock also makes an ATX version of it for about $95. The MB also supprts M.2 drives, so there is at least a bit of futureproofing there..however it disables two sata ports .

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-6500 3.2GHz Quad-Core Processor ($194.99 @ SuperBiiz)
CPU Cooler: SilentiumPC Spartan LT HE922 45.0 CFM CPU Cooler
Motherboard: ASRock ASRock H170M Pro4 Micro ATX LGA1151 Motherboard ($76.98 @ Newegg)
Memory: Kingston HyperX Fury Black 16GB (2 x 8GB) DDR4-2133 Memory ($59.99 @ SuperBiiz)
Video Card: Zotac GeForce GTX 780 3GB AMP! Edition Video Card ($250.00)

TL;DR:
As has been said million times before, the choice depends on your own needs and future proofing requirements. If you want to have an option to go SLI or get an overclocking cpu in the next few years, go with some of those Z170 mentioned above. I wouldn't really worry about special gaming features - I usually find those things more distracting than helpful. If you know you won't use SLI and K cpu, get H170 - either the one mentioned above or the PRO4 version - both will work nicely. If you know you won't use SLI and K cpus, won't put multiple drives in RAID configuration, won't need as many USB ports, there is also the option of B150 chipset (GIGABYTE GA-B150-HD3, ASRock B150 PRO4/3.1, ASUS B150-PLUS,...).

Cheers
S.