As with most things it all depends on your budget, if you want to go lower than 40mm then you will have change your front arb.
If i was you i would look at changing the ARB's aswell because it really does transform the car.
so for ultimate handling go for coilovers + uprated ARB's (not cheap though)
or for average handling go for lowering springs/ Sport kit
And from my experience the better the handling gets the worse the comfort gets.
