Move one up to 29 you'll have much more to do than at 19. Titles are extremely rare I see maybe one or two people a week with one.
I have a level 20 mage with private, would it be worth twinking at 29??
So you're going to let titles determine what you do in WoW?
Determine whether it would be worth twinking and making it a cool toon rather then let it rot. I was more asking if mages are any good at 29.
You may have better luck getting an educated answer by asking in the 29s forum.