Recommendations to downsize

I currently have a fully working hackintosh but I’d like to squeeze it all in a smaller case. My current components I want to repurpose are: - i5-6400 (6th gen 1151) - 16gb (4x4gb) 2666mhz ddr4 ram - 120gb SSD HD

I’m interested in matx and mini itx boards that would be able to repurpose all those parts. Having 4 ram slots is a pretty important part as I’ll be photo editing and this seems to make a huge difference and a full speed pcie slot is also a must.

Are there any particular mobos people have had success with?

Thanks