Help with profession

Your criteria don't narrow it down all that much. With all the buffs ArenaNet has added to the game it isn't hard to survive, nor are any professions without damage dealing potential (granted, some are better at it then others). Deciding whether you want to play melee, ranged physical, or caster would be a good starting point.

All three melee professions would suit you (just stack on damage buffs, spam attack skills, and hit as much stuff as you can to deal lots of damage). Dervishes are a bit weaker than Assassins and Warriors right now but they're getting buffed sometime.

Ranged physicals (Rangers and Paragons) don't deal as much damage as the other two groups. I've never played a Paragon but they look fairly one dimensional. Chuck your spear at things and spam your chants/shouts when they recharge, not to mention people will expect you to run the same build all the time. Rangers, while less powerful, offer a lot of build variety. They can use a variety of builds, including scythe, spear, and dagger builds for when you feel like a change from the bow.

Casters differ widely. I'd go for a Rit or a Necromancer because they have a lot of build variety. Mesmers may be fun too, but it's up to whether you find that kind of thing fun.

If you want to play a caster you should roll a Necromancer.
They can do huge damage using their primary profession as Death or Curses. They have excellent support options to make their teammates do huge damage in Blood. They are incredibly versatile and can run basically any caster build (heal or damage) reasonably well using Soul Reaping as energy management.
xPc.

Thanks for all the help, I'm going to give the Ritualist a go.

Let us know how you like it, I'm also interested in which prof I should play next =)