I agree, a level 19 mage is way UP for PVP. My favorite level to twink a mage (and obviously druid) is 39. Bring some swiftness pots and watch the assists and carries come in like crazy. Sheep and nova make you one of the best at assisting the flag carrier and blink (and for me escape artist) make very good flagging skills or PU skills.
You're welcome in the present. :D