Well, let me define some terms to make sure we're not talking at cross-purposes. When I say I want the game to be "vibrant" I mean that at mid-level* play I have the maximum number of build types that are effective, so for a vibrant game I want to be able to have the option of playing as (or playing against) a psychic heavy forcemaster or a necromancer or a golem-based wizard or a lot of other things. I want them all to be viable options. In option 1 (above) the psychic heavy forcemaster isn't viable because he just won't be able to play against the necromancer or the golem wizard, and I feel like that's a loss. In option 2, the necromancer and golem wizard have faded from play in favor of possibly-less-wonky-creature builds, and I feel like that's also a loss. Option 3 is the only option in which the number of viable builds (and, hence, "vibrancy") is maximized.
*I'll define this term, too. I think of mid-level games as the kind where all the players are competent, but no one is getting ready for a tournament or anything, and I don't know which mage I'm getting ready to play against so I haven't tailored my book for anything in particular. These are the kinds of games I spend most of my time playing and I suspect the same is true of others as well.