If you haven't already, get a high refresh rate monitor and a 1000 reports/sec "gaming" mouse. The Razer Viper Mini is light, which adds to the feeling of responsiveness. I've bought a couple for other people and they love them.

I recently got a 165 Hz monitor for my decade-old PC (Sandy Bridge era) and with my (now old) G302 mouse, it's like having a new, much faster PC.