That many miles will be achieveable so long as you don't rag it EVERYWHERE!!! We did a full set of a Porsche race spec car and he did them in 1,500 miles!!
Will pm you a price asap dude!
Failing going for the R888's, have a think about the T1-R's instead. Very good grip and we do a lot of work with some Evo clubs and it is by far and away the tyre of choice over the Potenza's.
Cheers,
Andy