I think I'm going to roll a ranger, but the guardian is also intriguing to me. I like how abilities work together, for example the elementalist can drop a wall of flame and when the ranger shoots through it the arrows light on fire and deal more damage. I think that's such a cool feature.
I anticipate starting on Saturday during the 'headstart'. It doesn't seem like servers are broken in to different flavors like pvp or pve so I guess all we need to do is pick the server that has a cool name!
Make sure you run the launcher now and then as they've been rolling out files every so often.