I am putting Michelin Pilot Alpin PA2's in 255/40-18's on my Audi RS4 (on RS6 18" rims since these tires have higher profiles to protect the rims from winter potholes).  The MTM 19" rims I use in the summer get bent in winter driving with lower profile tires-I learned this the hard way last winter.  But my Porsche's will stay garaged-I keep the P's on a salt-free diet.
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1997 993 TT Proto 3.8L 700HP

2005 996 TSCab EVO GT700

2006 Noble M400 "M600" 573RWHP

2007 Audi RS4 MTM SC 540PS