[Drummer$Dude]

I agree with replacing all struts and shocks at the same time. The front struts will usually wear out quicker in my experience but to keep the car "in balance" replace all four corners.

My car has never been on a track and doesn't have adaptive suspension, so I went with Bilstein B4 and replaced the stock springs with Eibach Pro-Kit springs which lowers the car a bit.