On stock front wings, the 8.5j may be to wide, it depends on your suspension but you will need around 10mm of spacer to stop it hitting the strut. I know Nicely's with ET32 sticks out slightly, but that i think is due to the wheels design, as the rim doesnt stick out.
I fitted 8j ET35 (with 5mm spacer) and Tein coilovers and 1.3 degree's (ish) of camber, the spacer was needed to stop the tire rubbing on the spring seat. Changed suspension to Apex coilovers and i bet i could ditch the spacer. Also looking to increase the camber at the front to around 1.5.
When i had the old wheels (9j +17), the front were running about -3 degree's camber (pillow mount over as far as it would go) and was decked to the floor (as low as the Tein's would go), the wheels tucked under nicely, but had around 2/3rd's of the tire on the floor (215/3*2 = 143mm on floor), the rears were the same size and suffered the same problem (225/3*2 = 150mm), fitted with P6000's (never buy) the traction was poor, to say the least.
Once i had the camber adjusted it pushed the wheels out a good bit (pic below), as a result i was pulled by the police (1st time in the S15) and given 7days to change or alter the wheels as they were illegal. I went for the 8j +35's all round i have now.
However, if i was to change the wheels (once funds allow), i'll be going for 8j +35 for the front, and 9j +40 for the rear. I'd like to go wider at the rear but would be happy with 9j
Quite a long post this, but what i'm trying to say is that there is no definative answer to widths/offsets/camber/heights unless everyone is the same
, i've learnt by experiance