I would recommend going Sage (subclass of Scholar). the reason is that you will be able to make your own adept IIIs (soon to be called Experts). For your spells this is important, but as a conjuror, it is especially important to have your pet at that level (Master I, soon to be called just Master, is the best, but adept III minimum).
well, there's my two copper. hope that helps.
oh, one final note, level 50+ sages are the ones that will be able to make the blank books for people to write in when that finally goes live(currently on test), so there's another added bonus for sages. Anyway, have fun, and remember, whatever you choose, have fun with it.