If this is any help I bought some G-max shocks for my 16i last year and got some Chassis Dynamics springs which lower it by about 20 mm. I couldn't afford Koni's and as the car had some very dodgy Monroes fitted and some very tired springs I gave it a go. It looks much better and I have to say the ride quality and handling is excellent. The shocks were £150 from Jondel Northampton and I got the springs from a mate who changed his mind on the project he was doing at the time. If money allowed, Koni's it would be but I am very happy with the results of this set up.
Hope it helps!
Bill