I have heard nothing but good things about the Kuhmo KW-11 winter tire. I just took a set of Alpins off the C230, and NOTHING could be worse. They are terrible!
I have boiled it down to two options:
Nokian Hakka 2 (studded - I'm in Alberta, we're allowed) $707 installed & studded
Kumho KW-11 $466 installed and studded
Might go with the Kumho and save some money.
1998 C230 "Black Betty"