Taste of The Wild has a good price and most cats seem to like the taste.
The Natural Balance that is grain free is green pea and duck. I am not familiar with this one, but think I have read that most of the protein comes from peas.....not sure. I have not used the Before Grain or Wellness Core.
You could do a search from the upper right of this section and get more info on these others.
I thought I would let you know about TOTW being a good price.
Good luck narrowing down the choices and hoping your crew is pleased.