If you plan on getting Morr rims, I would suggest buying a set of winter tires to mount on your OEM 19" rims, and put summer tires on the Morrs. Even if there is not a lot of snow, I'm sure it gets pretty cold there. As of now, the only option of tires on tirerack.com for the OEM rims are Pirellis Sottozeros which I had on my last car. They are fine on cold/wet/dry pavement.... not summer tire/summertime performance, but usable. I do not know for sure how they are in the snow.
But you have an Audi for that...
