200 is the min for the big name boys . eg the Michelin's are £230.
But there are occasional great tyres over here and the Sessantas fell into that for sure and for £100 less !! The Falken 452 tyre also is "good" on the '8 for similar. Last set were 452s but the Sessanta had the edge so going back to them. As good as Yoko, Toy Proxie etc for all round, though maybe slightly lower in perfect dry smooth tarmac - eg track.

We are seeing a massive influx of <£100 tyres in performance car sizes but as you'd expect they are rubbish.
Everyone who's ever complained in the club about the handling of the '8 has usually bought the car second hand with the Chinese plastic tyres fitted. Get them onto something decent and they cant believe it.