Yes, I would certainly agree that Inspiring Presence makes Nicholas extra dangerous. I can't really see many situations where I'd prefer Spellweaver, except something ridiculous like double Taste of Arcana. Nicholas seems like he's almost always better, mostly for reasons mentioned above.
I do agree with SCM that Horde Priest is one of the best (and probably my favorite). Sometimes commons like Circle of Blood will blow you out since they can make tons of little guys to block your removal (making an ally like Gladiator Skumm extra special). I've seen both Priest and Mage in "unstoppable mode" where few other classes have really reached that point.