I have Nokian winter RFTs on my 18' style 307. A bit noiser on the motorway, but they have been working just great in the snow in Klosters, and also on ice.
As for RFT, do you really want to change a tyre in winter? (Davos was -16 mid Saturday morning).
Anyway, great to hear you talking about winter tyres - def. worth it - check out the comparison: