Depends on what your looking for from a tire. Performance? Longevity? Rain performance? Price?
I've had 2 sets of Michilen Pilot Power 2ct and I think they do very well. The pilot power 3 is the next generation of that tire and is also highly recommended. I get around 5-6k miles from the 2ct but it provides is very good grip and inspires confidence.
The Bridgestone battleaxe is also a good tire for performance.