I put a set of 4 Bridgestone Potenza SO-3's (245-40 18) on my '93 600SL in January and am very pleased, although the ride is somewhat harsher than the original tires on 16" wheels. I expected more road noise but that didn't happen. Much quicker steering response and turn-in as well as far greater cornering grip than the OE Michelin tires. Can't tell you about wet traction, as my car has never been in the rain. Paid under $190 each at Costco with $60 off coupon - a great deal! Check out Tire Rack's reviews at
www.tirerack.com