I'd take a look at Goodrich Traction T/A's.  They are sport touring
tires which I have on my 300SD.  I've been very impressed with them in
terms of wet traction, handling and ride.  Previously I had Michellin
MXVs, which were absolutely awful on wet pavement, easily slipping from
a start under even modest acceleration.  Had Pirelli P4000's next,
which were excellent, much better wet performance, probably would have
stayed with them, except no longer made in the size I need.  The
Goodrich T/A's are also very reasonably priced.