I am driving my C-Spec right now, and I figured I'd help. Anyways, my WRX is fully modified, which I understand isn't the case for you, and it's sitting at 526 HP, so we may be in a different ball park, but this setup has always worked for me, I use it on almost all of my cars. Ok this is just my humble tuning setup for my C-Spec:
Suspension:
Spring rate: Max
Ride Height: Min
Bound: 4F 8R
Rebound: 4F 8R
Camber: 3.5F 4.0R
Toe: -1F 0R
Anti-Sway: 5F 5R
LSD:
Initial: 10F 10R
Accel: 60F 60R
Decel: 5F 5R
Full downforce, no drivers assist of any kind, MT, no VCD
The thing turns like it's on rails, it can take a very agressive driving style and still handle amazing. The braking is lightning fast, and I think MT allows you to slow down faster, but that may just be in my head. Overall the car is pretty twitchy when you first try to drive it, but when you warm up you'll destroy everyone.
Lates.