Facelift sports are slightly lower from the factory that the pre-facelift cars.
What Nicknick said, if you drop your car more than about 30mm you'll screw up the camber and go through tyres like nobodies business. If you're determined to drop it this much you'll need adjustable upper arms for the rear (about £140 for a decent pair) and camber bolts for the front (pretty sure these come in at under a tenner) and then you'd be as well getting a proper fast road setup done for about another £150-£200.
Or, just drop the car less than 30mm and save yourself the cost and hassle. You're best off buying progressively wound springs as they have better handling and ride characteristics than standard wound springs. Options are Tein, Spoon or Eibach (I'd go for Teins personally)
Remember, even if you get coilovers you'll need to get all your camber adjustment gubbins and setup done too