I went with the Bilstein B12 BTK kit, it consists of Bilstein inverted monotube shock, and matched linear eibach springs.
It was in replacement of some crappy lowering springs (about 5cm lowering front, 4 back compared to stock), those sings where crap let me tell you, on the straight it felt nice and smooth, not bad in the corners, but when i had to park the car, or drive to the summer house it was a nightmare… the car bottomed out on the slightest ditch or pot, also parking was bad, as the front bumper scratched the sidewalk, and the rear muffler tip hit against a taller sidewalk also…
Don't listen to someone who tells that a progressive spring is somehow better, it's bullshit, it all depends on the suspension geometry, neither linear or progressive is better by itself, it depends on the suspension geometry.
Anyway, if you're going after the look, don't spend a lot of money, and choose depending on price as all lowering springs are stiffer, and feel better compared to stock.
If you're going after performance it's more difficult, do a lot of research, and choose what best fits you. I've read that the Sachs performance springs/shocks are good, but don't have any experience with them, also few people in uk had successful seasons in drifting with the Eibach Pro Street kit (It consists of inverted bilstein monotube dampers + springs, so I believe it's the same as the Bilstein B12 kit)
The Bilstein B12 / Eibach Pro Street lowers the car 3.5c/2.5cm front/back, but the car is fully drivable, can park near tall sidewalks, etc.
From personal experience I can say that the eibachs feel a tad "soft" on the straight for my liking, in the corners they are amazing, also what may be "soft" for one person may be just right for another… Also I'm running 15" tires, so this may be why they feel a bit soft
If you want to go for all out performance choose Ground Control or Ireland Engineering, or Bilstein B16 PSS9
If you're going just for the roll reduction, performance tires, and/or stiffer swaybars can do a lot more than springs
Hope this helps