AB might be cool. I know some people who moved to there after my euro guild on Zek (Ancient Dawn) broke up.
The reason I'm asking this, is because I'm the leader of a 'classic' guild on The Combine (www.theforgottentravelers.com), and we want a server where the old world content isn't heavily farmed when The Combine catches up to regular servers and they allow us to transfer off of it.
We can still catch a lot of old world content on The Combine, but there are some people who just kill a bunch of old world bosses, solely for the serverwide message that happens after the kill.