I'm pretty sure the best setup to run spacers on rotors were 10mm front and 12mm rear.... My springs were £120 to be fitted by local mechanic... No idea on time wise as I just left my car there for the day...
I also get what everyone is saying on Eibach front onlys... I have 8P2 n think my H&R setup is bang on... The thing with the Eibachs are, the front arch is clearly cut higher than back, only fitting fronts creates positive rake on the car and I dont like that look! However, it suits the 8P3 as it pulls that huge bonnet down a bit...