I didn't think this out well.
I have done a rogue and warrior run, leaving me to need just a Mage run (for an achievement, of course. Achievements are evil).
I rather want to romance Isabela, but romancing Fenris with a mage is sooo tempting.
I did one run where I waffled and one run where I sided with the mages. That leaves the Templars.
I hear one can become Viscount (with achievement) but must side with the Templars to do it. I also hear a mage can't do it (which makes perfect sense within the framework of the game world).
These goals: mage with Viscount/Templars are incompatable.
Not sure I have the patience for two more runs.