I'd recommend H&R Race with some nice dampers if you want springs and a nice drop.
Although coilovers is no doubt the best mod I have done to my cars.
The Focus doesn't come with a whole lot of suspension travel. Every inch or part of an inch you lower it significantly impacts available travel, ride quality and handling. A two inch drop looks pretty but the downsides can be pretty significant for all other perimeters. I suggest a drop to no more than 1 to 1.5 inches. I believe this is the best compromise between looks, handling, ride quality and safety. Its about controlling impacts (to the degree possible) from road conditions as well. Do you really want to "creep" over every speed bump or railroad track crossing? Keeping the car off the bump stops helps preserve tires and wheels and maintaining suspension travel is the number one way of doing this.
Have you driven a lowered car? I hate how statements like this come up everytime anyone asks about lowering a car. I wonder how many people with statements like this actually have daily driven a lowered car for an extended period of time or if they're just outside looking in.
Saw someone post that H&R coilovers cost 1,100, they can be had on tire rack for 930ish shipped all day.
Also probably another outside looking in thing, but on my last focus I ran no camber adjustment at all and had absolutely no problems. Tires wore perfectly. On new car, spc arms were already installed on rear, but no need for camber plates. The way the previous owner had the spc arms adjusted ended up destroying my tires due to fender clearance but I let it happen as I wanted new tires anyway.
To sum it up, I vote coils, and would recommend Ksport personally, but if you must go springs, I vote h&r race with say some koni dampers.