Zell Miller is absolutely fantastic and I wish to God we had 98 more guys just like him. Miller is decidedly liberal/progressive in his politics, but the man understands the differing constitutional responsibilities of the states v. the Federal government. He was accused more than once on flip-flopping on the issues when he was in the Senate since he opposed programs that were similar to and/or mirrored programs he himself had championed in Georgia. Zell Miller never flip-flopped on many of those issues he just just understood what was appropriate on the state level was not appropriate on the national level.
Lieberman on the other hand is an absolute horrid decision. Why the hell would you ever vote for the guy? You agree with him on one thing and one thing only, the war. You do realize there's a thing called "domestic policy" and on domestic policy he's decidedly liberal, right?