I had Dunlap SP 8000s on a previous car. Tread life was very short (18,000) but they were an excellent summer high-performance tire. They were fine in the rain and stuck like glue. However, don't even think about driving in the winter with them. You can probably do OK in dry winter, but they sucked in even just a cold rain. They just aren't a winter tire. They are relatively cheap too.
For daily driving, I'm going to have a tough time not going with the Goodyears that came with the car (gatorbacks?) when it comes time to replace them. The tread life is excellent (23,000 miles with at least another 10,000 left.) They are perfectly fine for the street in all 4 seasons. Besides, I run around on Nitto DRs in the summer (with stock Goodyears on the front.) Maybe there's a better all-season performance tire choice, but the Goodyears aren't all that bad IMO.