Here is the gigantic list of micro ATX motherboards to choose from on Intel's new Coffee Lake platform.
https://pcpartpicker.com/products/mo...ard/#c=128&f=7
That list will be longer soon because the only platform to be released so far is the top end z370. The rest arent coming til Q1 2018.
Personally, depending on the age of your case, I would upgrade it along with the build just to get an updated front panel i/o. You can get a decent case with all you really need for like $50.