Don't forget this one.Rush. Could stand that voice for years, but once you get over it, awesome libertarian lyrics and awesome music.
A few suggestions:
Spirit of the Radio
The Trees
2112
One of their other album-side-length song. 18+ minutes.
Hemispheres
As for the libertarian-themed lyrics in some of their songs, I've always liked this one.
Something For Nothing.
Xanadu
And for anyone who doesn't like the sound of Geddy's voice, there's always this.