r888 are soo expensive. i would throw federal 595 rsr into the mix. they start with 7mm tread and i think 888 are 5mm and they last longer than 888 apparently.
at llandow circuit i cut 1.7secs of a lap compared to toyo proxes 4s. r888 would be a few 10ths quicker from what i read but value for money nothing beats federal