ok performance wise would you recommend going with a smaller rim like a 15 instead of the 16. i think the weight difference is like a pound or two difference. i think there like 16 or 17 lbs a tire.
i autocrossed with a 16, and a 205/40r16 tire, with the pressure set, it performed terrific. I daily run a 195/45r15 tire, and with the same pressure checks it holds up as well as the car can handle.
The sidewall is a sort of compromise, you dont really want sidewall deflection in turns, but you need enough that the tire stays "flat" to the ground. so in aspects of tire performance, your talking a difference of more or less a 1/2" of sidewall between the two choices your looking at. I dont think you will feel a difference unless you really push the car hard. And as far as pot holes etc go, if you put the tires to the proper pressures and they both have reinforced sidewalls reflective of the size, there should not be a problem if you accidentally hit a pot hole.. my tires are small in comparison, and i've hit several potholes without any problems. If your really worried, buy a run flat tire, they deflect the least of all the tires, but are more money.