[Dadstoy]

I've got an '87 911 Targa with stock 16" wheels. (I assume they're stock, thats what I got it with and they look stock). Its getting time for me to buy new tires and I've been dissapointed with all the choices I've made so far for tires.
First priority is stiffness. Every tire I've put on this car so far has had a lot of sidewall roll so I get the roll-and-catch in the corners.
Second priority is cost. I'm not looking for a budget tire, but something preferably under $180 each.
Third is grip. I don't ever race, and any summer tires will probably have enough grip for me.

I'd like to keep the same diameter I have now;
205-55-16 on the front
245-45-16 on the rear

Thanks in advance
Ken