Dont forget when it comes to coilovers:
a) You get what you pay for
b) What do you want them for? Eg. To slam the car on it's arse or for actual handling improvment for track or fast road abuse?
When I 1st lowered my car on FK Highsports (£500) I just slammed my car, thinking lower is better (range -20 to -120mm) and when I waited to raise them because the car was toooooo low and couldn't, I brought Bilstein B14 Coilovers (£900 odd) and they only lowered the are up to -60mm or -80mm can't remember.
I thought my FK's were stiff untill I tooko the car for a spin with the Bilstein's on and found what they were stiff and the FK's were as soft as a teddy bear!
I'm not saying the TA's are crap because I haven't driven a car with them fitted but the differance between the FK's to the Billies showed to me in build and performance!