Noob here! I have a simple and probably frequently asked question.

Back story: After a few weeks and hours of lurking I decided to leave my previous server and restart with a 4 man team on Virgo ranging from lvl 50 to 56. I have 2 fires(one for physical and one for magical damage), an earth (magical damage but probably going for sealer/wit) and a water who's yet again a magic user. I followed some build tips to make my life easier by building my own team for bursts.
Also I don't want them for pvp. Well not yet. Maybe later.. with new chars.

My question would be: If I want my water to be a full support character with high survivability what should i chose? Wit, Priest or seer? Or shall i just go for magic knight? 2 of my chars got help from one of these fine gentlemen when I bought GS.
What I want him to be is a priest. I read it can do what i want him for, and it will be able to seal a little too.

They are far from being complete, but I don't want to mess up the build(s) simply because my decision started to waver.

tldr; Help! what should I chose Water wit, seer or priest?