Those look pretty good. I had Blizzak's on an old Jetta and they worked wonders and I was going to do the same thing on the 300. Have trouble getting up my driveway.
http://www.sminnick.com/newhouse/IMGP3517.jpg
My question is what is the $180 for the TPMS senser stuff? I would consider ordering these. And with the pitting on the original rims, it's probably a good idea to run different rims in the winter.