I recently had to buy new tires for my '92 735i which I recently acquired.
I logged onto my on-line Consumer Reports account and decided to go with their #1 rated performance tire, Falken 512's. I've had them on for a week, drove Highway 1 from San Francisco north today, and must say that I think they're pretty good. With the old tires (Continentals), I really had to muscle the steering wheel.
Car sticks to curves and seems very happy. Very smooth and no noise. (I had seen reviews that complained of noise.)
They were $344 total at Big O (great name).