I've used G.skill and Adata for all of my computer projects, including two Mac Minis for a friend of mine. Put 16GB 2*8 in a new Core I5 unit without issue.
Just stick with default voltage and timings, nothing fancy as you can't enter a "BIOS" and change the settings.
How about Kingston or Corsair memory? I thought you can put only 8 gigs total in the i5 Mac Mini which i have Apple told me. Thanks