It depends on what you want and want to spend. AB springs and Koni shocks is what I use and I find them perfect for road use. For track use something a bit harder would be better, but in my opinion you would need to get good (=expensive) coilovers to have an improvement over the Koni shock/AB spring setup. Black Art Design (BAD) is supposed to do good coilovers, but it's about 3 times as expensive as the Koni/AB setup.