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Hi, I’m in a similar situation and I’m curious about what decision you made?

I didn't buy a mac. Instead got an external HD and loaded El Capitan. All apps seems to work fine.

But if getting a new mac, then anything non retina and pre 2014 should be ok.
 
Photoshop CS6 insta-crashes for me in Sierra+ when I close a floating document window. Still works for tabs and you can set a preference to make that the default but that is a pretty major usability issue IMO. Tear off a window, click close and it makes the entire PS session go down in flames.

Also seems to have gotten slow in a few areas in these newer OSes. I'd recommend to use an older OS if you want to stay with CS6. E.g. works fine with Mavericks.
 
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