Here's a nicely organized post for you to bookmark or keep in mind.

Voting links:
http://minecraft-server-list.com/server/262180/vote/
http://minecraft-mp.com/server/69823/vote/

Page with both voting sites embedded:
http://votemc.github.io/#g6d696e6563726166742d7365727665722d6c6973742e636f6d2f7365727665722f3236323138302f766f74652fg6d696e6563726166742d6d702e636f6d2f7365727665722f36393832332f766f74652f