hi there,i am thinking of changing my old tyres to dunlop sp9000 as it is comparatively cheaper than brands like conti and pirelli, unfortunately, i dont know much about tyres. all i know it is very important to get a good set for maximum safety, dont really want budget tyres....can anyone tell me more about these as i want something comfy and quiet, not much of a performance person...and how much would it cost per tyre here averagely for 18inch 225 front and 255 backcheersck