I was talking about wheel diameter, sorry for the confusion. Yeah I agree that 1 high performance tire isn’t enough. My issue is that I don’t want to jump up to 17in rims. I might look into the tires @phattires mentioned. Is 215 on a 8in wide rim ok typically?Perhaps I'm a bit confused...when you say the same diameter are you referring to the tire diameter or the wheel diameter? FWIW I've always used OEM wheels (16 inch Enkei's very briefly) & the car handles incredibly well. Definitely not aggressive in appearance but with the OEM wheel size good rubber is cheap & options are plentiful for all driving situations. Either way, as was stated ppl have preferences based off of every variable of their setup from the wheels & tires to the suspension, strut/sway bars & even their alignment. Every suggestion should be taken with a grain of salt based on how your setup as a whole varies from someone else's (even with the same wheels & tires).
I would reiterate again that you should pick the wheels based off the available tire options (UHPS/UHPAS/track tires) for what you plan to use the car for. Personally, only having 1 high performance summer or all season tire available wouldn't be acceptable for me but YMMV