Spring rates 8 front and 6 rear is usually the norm for GSR and EVO's and it seems to be the go for my AWD coupe as well. The coupe is fitted with all the bells and whistles (electrics and aircon + strut bars, fender bars etc) and only weighs 1240kg (same as a stock EVO).
Im pleasantly surprised with the BC inverted coilovers I got. They are a very good affordable coilover. If they didnt have the damper control I'd have to try to find a coilover with a common ground between something comfortable enough to drive on the street, but still good enough for launching at 6500rpm+... which aint going to happen.
I have the BC inverted coilovers with 30-way adjustable damper control set on about 20/30 stiffness and its comfortable enough on the street and handles extremely well. At the drags I think I softened it down to 10/30 and reduced tyre pressure to 20psi and it allowed the rear end to drop down and improve traction to the rear / lift up the front end when launching
It knocked 0.5 seconds off immediately :lol:
At full stiffness it feels like you're feeling every little bump on the road and it is quite annoying and rediculous - its not a street setting and therefore thats probably best chosen for the smooth surface of a circuit.
For a street/weekend fun car definitely go something with damper/resistance adjustment so that you can play around with handling settings to suit whatever conditions youre driving to ie street, track, circuit, dirt, bumpy unsealed roads, wet weather etc.