at 60k miles on a 09, sounds like a good time to trade up.
i definitely like the sport brakes. works great especially for street it's plenty of power. looks good too, no complaints.
the SRM is great. i think you'd probably want one even if you dont use it if you bought a 370z. it's one of those 'featured' things special for the car. be like buying a blackberry with no qwerty keypad...