Have your store order a couple gallons of SuperPaint velvet to try. I think both the SuperPaint satin and Cashmere low luster are too shiny, the velvet is perfect.
To the op, I'm not a fan of anything Promar. SuperPaint is a great middle of the road paint, along with Cashmere. For residential interior painting, with the exception of real deep colors, those two lines are all you need. They're easy to work with, cover great, and are durable. If I need flat I use the Cashmere flat enamel and if I need more of a satin/eggshell finish I go with superpaint velvet.
Almost a year ago now I took up the carpet in my office with plans to put down laminate instead. In the meantime it was just a bare concrete floor so to keep the dust down I took some leftover SuperPaint velvet I had and painted the floor until I got around to the laminate. It's been almost a year with my office chair rolling around and it getting walled all over and it still looks great. When it gets dirty I just mop it.
If superpaint can last a year on a floor and hold up fine there's absolutely no reason why a normal residential interior requires more than that on the walls.
Also, I'm not a big fan of BM ultraspec or Ben. If I were to ever switch to Benjamin Moore it would be to the regal which is a fantastic paint. Is it worth $15 more a gallon and added difficulty to get ahold of? Maybe, depends on the job and color, for me most of the time it's not.
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