There's a new "Overseas fan's choice" category in this year's seiyuu awards (3rd annual). So that specifically people outside of Japan can vote for their favourites!
See:
http://www.seiyuawards.jp/eng/
It says:
"Enter voice actors and actress name and the name of the characters that voice actors and actress has played."
So don't forget to mention some characters as well as the name of your favourite seiyuu!
You can only vote for one person. Oh it's so hard to decide!! >_<
