Obviously, those all sound pretty awesome. Also probably obviously, my magus only has particular interest in either the Archmage or the Champion bonuses. Less obvious (to me, anyway) would be which of those sound more useful for a magus fighting demons. An increase on the crit multiplier could be a big damage bonus when using magus spells to boost damage, but I don't really know how spell resistance works, or if that's what demons typically have (as referenced in the description of demons provided as an example in the player's guide). I'm hesitant to go research types of "common" demons in order to form an informed opinion because spoilers, yo.

Anybody have a suggestion?