I went from 195/60/14 ->195/50/15->205/50/15.

The car handled significantly better going from 195/50/15 to 205/50/15, braking distance was reduced (ABS wouldn't kick-in as fast or hard). Tires gripped harder, and steering wheel had better feedback.

I think 195/50/15 threw off my speedo by 1-2mph @35mph (those police radar trailers posting your speed).

The biggest consideration is the tire company. The guy who I bought the GSR rims from had cheep a$$ 195/50/15, and they did not handle at all. My 195/60/14 AVS Intermediates were 10X better. Now I've gotten some Falken OEM 205/50/15, and they handled pretty close to the AVS-I and @ $42/tire and 360 tirewear... I think its worth it