first 3 sets of tyres i used Michelin Pilot Sport PS2 - can't fault them except for the price. Decided to swap to goodyear asymetrics and have stuck with them for the last 4 sets, they wear a bit quicker than the ps2s and are fairly loud, but are as good as the PS2s in wet & dry + cope with snow pretty well for a summer tyre.
For £100 a corner I wouldnt touch anything apart from goodyear asymetrics. PS2s aren't good enough to justify the price and I don't feel like crashing testing an unknown brand to save £15 a tyre...
My 3 would be:
1. Goodyear Asym
2. Mich PS2 (imo better than the goodyear, but not worth 30% extra £)
3. Conti sportcontacts - really good, just never tried on the s3.
Dont think I'd try another tyre from toyo, falken or yokohama again, no experience in the s3, but all were ***** on my last car.