I've been to Zen Sushi a few times, it's very good and the staff is friendly but there are better out there in NJ. Ari Rang's sushi (it's a hibachi steak house) on route 22 is a little better in my opinion but both are very good.
Minado is mediocre at best....buffet sushi usually leaves allot to be desired in my opinion. Try Minado then Zen and you'll see what I mean...of course at $20 a head who is going to complain?
I'm always down to try new sushi places and will be trying out many of the places listed in this thread.