Originally Posted by tonymac1
I would probably go with Lm 60s with 255 and 275 then, since i don't want the tires to be too stretched and it seems like LM60 is the only one with these size options.
Just put my Blizzak LM60s on for the start of their second winter season. Last winter they did fine in snow here in the Northeast, and were decent in the dry as well. They are a dry performance oriented winter tire, so they obviously won't have the ice and snow grip of a Nokian, but then the Nokians probably ride like knobby truck tires in the dry. It's always a tradeoff.
In any case, the LM60s do fine in conjunction with the M3's LSD, traction control (and ability to disable traction control when needed), and balanced chassis. They are 500% better in snow and ice than any all-season tire.
I run them in your proposed 255/35-19 front, 275/35-19 rear setup on my stock ZCP wheels. I have a set of black GTS wheels with Michelin PSS's for the summer.