I think the top 2 are great choices. Just because Mario Karts' Red turtle shell DOESN'T kill people, doesn't mean it's not a great weapon. Talk about a homing projectile that seeks out the next person in front of you. The weapon only compromised by a person using a weapon as a shield behind them. Topped only by the "Blue turtle shell" which seeks out the person in first place and there is no way getting around this shell from hitting the first place player, and sometimes even some other players along the way.
Personally, I feel first choice was only due.