Where to start on this one....
Ok How much will you be lowering the car ???
If it's more that 30mm you'll need to replacw you shocks for shorter ones, But your shock must be in good condition anyway to change the springs for shorter ones.
16" wheels will require you to use low profile tyres which will give a harsh ride you'll have to avoid all potholes to stop from breaking alloy's & tyres(Personally I would'nt go bigger than 15" in a 33) Also the rolling radius of the tyre would be increased meaning your speedo would give the incorrect speed.
What is the mileage on the car ???
It is a good idea to replace the bushes in the suspension which will tighten up feel of the car & it's steering.
Recommendations 15" wheels, Springs with a 30mm - 35mm drop. Koni Adjustable dampers front & rear (I'm not sure if Koni do adjustable rear dampers.)
This will allow you to setup your suspension to your liking & adjust it to a harder setting if your doing track days or fancy going for a long hard spin.
2x 145, 4x 75, 4x Sprints,a 156, 146 now a 155