Replace dampers and springs with coilovers

Is it advisable to repalce my rear damper and spring setup in the k12 with a series of coilovers. Or should i get coilovers and get dampers and spring for the rear as per factory setup itself. I am not in need of lowering the car as much as shock absorption and ride height. My daily drivers has roads with lots of potholes and uneven surfaces as well as major humps, a lowered car would just scrape.
 
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