I found a bargain and I’m getting a z370 mobo nowLook for the cheapest Z370 motherboard you can find with the features you want and see how that compares price-wise with a B360 with the same features. You may get lucky and find a good budget Z370 motherboard on special offer. Your CPU upgrade path in the future will be much wider if you have the option of overclocking K processors.
Don't forget to post your findings back here before buying though to make sure you're not accidentally getting a dog of a motherboard.