Whats the element of the p1 ninja you use? Get that then. If not, Torune next.

Torune is better. In the grand scale of things, 500 initiative isn't all that useful compared to 30% more damage. Minato is only worth it if you're in a tight race for initiative within your server cluster. There are tons of immune ninjas and again, its better for you to get the elemental ninja cards before you get Minato. (IE if you use Minato a lot, get the Temari card)