I was going to say S2000, but it won't be as comfortable as a BRZ/FRS on that long commute everyday.
I commute in my S2000 once or twice a week, a 100mi round trip each time. I've tracked fuel consumption for a year now, and I'm averaging 28mpg overall. The factory hardtop alleviates some wind noise and gives me another inch of headroom. At 6'2", I'm a tight fit in the cabin but I deal with it. Not only is it a great sports car but the reliability is up there with any other Honda. It's what convinced me to get the S instead of an E36 BMW M Coupe, which I'll admit I still drool over!
I've driven the FRS and it's a fun yet still comfortable car. I felt like it slotted in nicely between a Miata and S2000 in terms of performance, but was more utilitarian and easier to live with than either one. It seemed like a better compromise for daily-driving when compared to the S (more comfy, but less power and maybe slightly better mpg?).