Hi Guys, I'll give you my 2 pesos (I'm on business in the Philippines right now so I have lots of Pesos).
I think the best wide receiver group is a bit of a mix of guys who can move the chains and block like Puka or Kupp and an X who can get downfield in a hurry with blazing speed, plus if you have a TE that can go straight down the seams you really have a good group. If all 4 of these guys can catch the ball well, you can really have an effective group, and also this kind of group will open up the rushing lanes. The defense will be stressed and you will definitely move the ball.