Originally Posted by
jpatokal
Well, with the obvious exception of the Chuo/Sobu line, which is occasionally very handy.
All things considered, though, just go for a Pasmo -- it works everywhere and, for most travelers, the price difference is minimal or works in Pasmo's favor. You'll probably need one anyway for the other two days.
Just a reminder that OP already indicated that he will use NEX + Suica bundle, there's no need to get Pasmo as they are connected, one can use Suica card on Pasmo system and vice versa (though sometimes not all gates are Suica enabled, there should be at least one gate with Suica service that they specifies it)