So... Spent some time on the Tire Rack website browsing through winter tires sizes.

Stock tire size for the 4.4 Sport 19's are...

255-50-19 Fronts
285-45-19 Rears

The only thing I could find in matching sets that were close where these...

Blizzak DM- V1
255-55-19 $169 ea
275-45-19 $207 Ea

Or

Pirelli Winter Carving Edge
255-50-19 $254 ea
275-45-19 $242 ea

I've had Blizzaks before in various models and sizes and have always been happy with them. Not not totally sure about that rear size that's available in both brands. I'm guessing it will be okay. Wish I could find a 275 with a 50 series, but there isn't any.