Welcome to the forum Satishds
Suspension modulators are a cheaper way to achieve the kind of ride you are after. however there are no guarantees that they would work for you. It can go both ways. Since you are yet to buy the car , its better to rethink twice if you really have to buy this car knowing that you are not happy with the ride. Afterall its your hard earned money and you don't want to regret buying it if just in case even after all the mods you are still not happy.