215/40/17 seems to be the popular size
Thanks peeps
Narrowed the choice down a bit
http://camskill.co.uk/products.php?plid=m54b0s103p0
Yokohama Parada spec 2's - Had them before, could not fault them - £75 each
Falken FK452 - Emma has them on her 18's and loves them - £62 each
Vredestein Ultrac Sessanta - Moley has them, swears by them - £77 each
GoodYear Eagle F1 GSD3 - Have them on my C230K, faultless - £96 each
Opinons please