Wheel sizing / offset advice?

Hi guys,

Have been doing a fair bit of research on the forum regarding wheel fitment. Big thank you to Grennan and ducker85 for their consistent input on this topic. Despite the significant amount of info on the topic, I'd like to ask for some input on my own personal circumstances.

Car: 2012 SS V Z Series VE Series II Manual MY12.5 Sportwagon

Planned suspension: King Spring 'Super Low' Coils (Front: KHFL-150SSL | Rear: KHRL-152SLHD). Bilstein B8 struts / shocks.

What am I trying to achieve?: Car is daily driven. I want it low but not ridiculous and want to maintain some ride comfort. Trying to achieve a tasteful aggressive offset / stance / staggered look (or whatever the F**K you wanna call it) without going over the top.

Couple of points:

I don't like / want stretched tyres.
I want a 275 tyre on the rear
I don't want to roll the FRONT guards
I would prefer not to roll the REAR guards but if I have to, as little as necessary
open to factory adjustable -ve camber but no more
I would like the wheel sitting as close to the guard as possible whilst still being 'tucked' NOT 'poked'. Would like the arch to sit level with top of tyre or preferably slightly over.

Loving the look of Tommo-27's car. Probably my favourite so far. Has good height, concave wheels and semi aggressive look without being over the top.

http://forums.justcommodores.com.au/...ck-08-ssv.html

At the moment I'm thinking:

Front: 20 x 8.5 25-35+ with a 245/35 Tyre - Will the front require any modification or camber adjustments with the chosen suspension? I'm led to believe the 8.5" 25 will get it almost flush which is why I'm thinking 30 or 35 would be better to get it inside?

Rear: 20 x 10 40+ with a 275/30 Tyre - How aggressive will the guard roll need to be for this setup? Camber adjustment?

Thanks guys.

Joey.

PS - My pick for wheels atm is KOYA SF04.