Coilovers are great if you can justify the expense. Most if they are honest only adjust them once. Equally most don't get them set up right. My last car, it cost me £150 just to set them up and one big pot hole (like the roads after a bad winter), they need setting up again!! The other issue is they will expose (like most suspension mods to be honest) any other weaknesses in your suspension.
I do love them though and if anything, I'll wait till a set come up on here secondhand.
I have H&R's. They are low but hard. Cup spring is better but not low enough for me. Since going to 18's, H&R's are much better ride.