Well it depends on your body type and if your car is a DD. I have a friend that sells racing seats that are phenomenal. A lot of people at Honda-tech rave about them: http://www.memoryfab.com/products/accessories/
Racing seats can help hold you in during tight corner, but they also improve handling by lowering both the driver's and chair's center of gravity. They look good and can be comfortable; that is if you're the right body type.