Since you are concerned with a "rough ride" than don't get the SS-P, they will be more firm than the regular SS with the stock topmount and bushing. Coilovers in general will produce more noise, etc just because there is more moving parts. If you want to try something different, you could try something like Eibach prokits with some performance shocks. Might be a bit more "stock-like" in ride quality.