I am looking to get a set of coilovers for my 87 FC. i looking to do dragging. i looking at the different setups below. i want to know, what would be best setup as far as price vs performance vs rebuild abiltiy.

HKS Hiper-D
Price Used $950
Spring Rates f:8k r:7k
they have 800 miles on them they are from a friend and are in great condition. i would love to get these but dont know if they can be rebuilt.

Stance GT+ Pro
Price New $1200
Spring Rates f:9k r:7k
I live by there office in Elk Grove, IL, so that might be a Plus

Lastly
Tien Flex
Price New $1300
Spring Rates f:6k r:5k
I am not interested in the edfc optionright now but if i get these i will probably by this later.

let me kno what do you guys think.
Thanks