Ask a Magician Thread.

Doom is really fun to play with, not many practical uses in training. Door is nice to have maxed because you can train somewhere like Deep Leafre, door yourself to Leafre, repot and catch the door before it dies. :/
At 107, not much time left to use Dragon, although the points would probably be better used there than Doom.
I'm not a priest, so don't take this advice without thinking it through/getting someone else to back it up. xP

Naw, this is decent advice.

What I'd do is get a level 10 door (2 minutes), so that you can time it with HS, then use the rest of the points in doom. Personally, I never used dragon a whole lot during 3rd job anyway. It doesn't make much of a difference now, as a bishop.