Hi! I think your lineup looks quite strong especially with poison tai. I do recommend thinking about it before getting Han. Han is a very situational ninja, sometimes its better to save for ninjas you want to use in the future. If you don't have it already, I would personally go for Roshi instead xD However, it is really up to what you are aiming for, I have seen some people excel at using Han, endless possibilities for you to imagine =]

~Jib