I've been running 19s since 1 week after purchasing my car. I am glad I went that route. I didn't notice that much of a rougher ride with 19s. I just have to pay close attention to the road looking for hazards. But I'm use to that as I run 22s on my Denali.
If I had to do it all over again, I would go with 19s. I debated a long time over 18s or 19s. The roads in my area are not too bad so that helped in the decision.
For the track or autocross events, I use my stock 17s with MPSC tires on them. The 19s are for around town driving.
-David