r888s should be in a better of supply sizes by mid next year. the larger diameter sizes came out first. i'd have to check if tehy are out in ur size. i am hearing experiences all over the place with these, all good, but from the ultra positive that these are a tic below the A6/v710 to they are slighly better than the RA-1.
since Frankn7 will never be out in the rain, running old stock of RA-1s that will hopefully be on a nice discount would be great. otherwise consider the RE-01R which will give a chance if u get cought in the wet. i hear toyo has new one out for ultra street performance alled the RA-R.
consider the hankook z214 as compettion tyre. c50/51 is the medium which should cover u. the bfgoodrich r1 got a nice writeup in GRM i think, though they beleived the kook would be better ona lighter car(tested on a subaru, they beleive it better on a miata).
i personally am considering the R888 and the z214 as tyres for my original set of wheels when i wear out the allseason this fall/next spring.
The re-01r may again fall under a rebate like there was this spring/summer.
edit: re-01r isnt wide enough yet.