I did a suspension refresh, Bilstein B6 dampers all round , Eibachs springs, Whittling 22mm Rear ARB, PU rear subframe bushes, replacement rear arm bearings, new top mounts and wishbones and drop links, handling was transformed from a slightly wallowy GT car to a nimble and lithe sports car that you could use throttle to adjust the line the car was taking.
I fitted one of Mariusz LE kits and PIU rear bumper and never had any issues with speed bumps (I just approached them slowly), or ferries.
Good luck you won't regret the refresh.