Here is a wild suggestion: BFG AT KO. (Note: i know nothing about winter tires because i just don't see snow in Texas.)
BFG AT KO tires have the "snowflake" symbol, indicating for severe snow conditions. It is the only all-terrain tire that has this symbol.
The reason i bring this up is because you can buy these AT tires (does also come in 17" rims) and use it year around. Thus, there is no need to change rims and tires for winter.
I have the BFG AT KO...i love 'em!
Just a suggestion.
P.S.: check out this thread:
http://www.toyota-4runner.org/showth...=&threadid=226