Growing up outside of Philadelphia's suburbs, I'm no stranger to the snow. However, I've never purchased actual snow tires. My last two cars were 4th Gen F-Body Camaro/Firebirds, both being RWD + both making 100+ more horsepower than this car. I've always used All-Seasons. I had Cooper Cobras' on the Camaro, and Kuhmo something on the Firebird. I've never had any issues with either tire.
But the decision was easy for me for my FR-S. I'm not planning to race the car, I might track it, but for fun, not for competition. An all-season will suit me well for the winters here in Baltimore, considering I only commute ~10 minutes to work, after 12PM (yay plows!). So I decided to pick up a set of 4 Continental ExtremeContact DWS06s, 255/40/17s on 17x9 wheels. Should work nicely for the snow, and well for the rest of the days.