Are you sure you didn't just skip over this part? Don't mistake my emphasizing for belittling but I'd venture to say your endgame events consist of well organized parties/alliances and you, like everybody else, doesn't
need their mp. I wasn't sarcastic about the melees and mages going naked in these situations and winning, either.
There
will be those times where you'll need every bit of mp to keep hp up(I guess in the case of galka blm and sch it'd be different but you'll face mp issues soloing on pets otw to 75, farming things like obis/hq aern organs solo. Anything solo you'll face mp issues.) and that's when you'd be better off taru.
Though, at any low man event or solo it always will be xxx amount(I really have no idea how much a naked taru would have over a naked galka but whatever it is(200-300 maybe?) that's always how much more taru will have over galka at any event because if it's lowman like I said the taru will start resting later than the galka but neither will ever rest to full in these situations.)
Tbh, my post isn't too relating to the OP's question

pick whichever of the mages you'd like. They'll all face the same problems just as hard. Like Plow said, the int/mnd values of the races is more impacting unless all you do is solo.