Mewtwo
Answers
I took my 12/12/10 to level 30, I didn't get an EX this week, so I don't regret it. Depends on how much you raid and how much dust/candy you've put in your other legendaries already. I have Lugia, Moltres, Zapdos at level 30 and have 95 Raikou candy waiting for power up. This freed me up to put 235+ rare candy into Mewtwo candy and use 66 of them. Already collecting more rare candy and enjoying bag space.
Thanks for the advice guys. I've already shoved 150 rare candies down his throat. Been saving everything strictly for Mewtwo. Level 37 and already have everything I'll ever need(but still have many wants). I do raid quite a bit, so I do have a good chance on getting another pass... but... He's what I've been waiting for. Hes my first. So I'm very tempted.