Can I play with?
Heh, just pick whatever you want. Since she is healer you won't have any problem finding groups. Pick something fresh and fun and new for you, but, do NOT pick the same class or you'll have to do all the class stuff twice. All classes can help each other with class stuff, so don't worry about that. If you want to mainly group, going tank might be nice since you'll be able to coordinate better and get good practice at your roles so you won't have to worry about having bad tanks or heals in instances, but if you want to quest or pvp more go DPS. You can't make a wrong decision in duoing.