If you want non RF's, then you should replace all 4 tyres. If you are sticking with RF's then replace both fronts with the same tyre
I cant speak much for the non RF's as I have RF's still. I can 100% recommend the Dunlop SP Sport 01's. Still run flats as I say but they have a softer tyre wall and improve ride quality over other runflats (inc. their predecessors the SP Sport 3000A's) IMO. They're new tread pattern is really grippy too! Couldnt recommend them enough if its run flats that you decide to stick with
