s
I've just picked up Guild Wars and I'm excited to play. I enjoy playing caster classes in RPGs, and prefer to do lots of damage, rather than serving in a healing or a buffing role. I'm thinking about the Elementalist, because they have a ton of high damage spells that look like they can kill foes quickly. The Mesmer also looks interesting because it has a variety of damage options, and it also has utility with condition spreading and weakening the ability of mobs. (I also like their armor better.) I plan on soloing with AI aid most of the time. Which class seems like it would be good for me?

Well, not Ele. Once you get into the later parts of PvE/Hard Mode the armor levels of foes reduce your damage to crap and you're better off with armor ignoring damage spells like those from the Mesmer or Necromancer. Ritualist may also be of interest.
"Not Ele"