My understanding of the reviews are that the Sottozero 2's aren't as good as the 3's.
Also, the Bridgestone Blizzak LM001 is a good option in the correct size and load rating. They were my other item on my short list.
Discount tire had more good winter tire options, but they didn't have a wheel combo that would work at the time. Getting the tires mounted, balanced and shipped directly to me was valuable to me.
LM001 was on my short list as well.
Every tire in this list was on top at one point but ultimately this would be my preference.
X-Ice
R3
LM001 (This is V speed rated)
Continental Sport
Sottozero 3 (This is V Speed rated)
I was initially leaning towards Speed Rated thinking they would be quieter. But that didn't seam to be the case.
Note: There is another thread going about an issue with losing Regen at high speeds after mounting snows.
I have no evidence of that yet, but I have not been at full regen due to temps since I put the X-Ice on.
This could change preferences if it's tire dependent. That is, the weight of higher speed rated tires (e.g. Sotto 3 V) could be more critical than we thought.