Mate runs R1Rs as 'wet' tyres on his E36 BMW track car that lives at the 'ring, he rates them for that use.

Also look at Kumho V700/V70A Ecsta track day tyres, very good tyre.

http://www.kumhotyre.co.uk/circuit_racing.php

They have a proper motorsport carcass, much stiffer sidewalls and construction than R888s for example.

And they last longer than their competitors in medium/hard compound.

Tried quite a few of the track day tyres in my track day...ermm days..lol