Solid post! I'm with you on the majority of your picks. Niles Paul is arguably one of the top five wideouts going in to next season. I also think Brandon Kinnie is very good. I think he has the size and talent to play in the NFL someday. Khiry Cooper's routes are fluent and he has very good hands which is why i feel he'll be a pretty good player for us. My fourth choice at wideout is Quincy Enunwa. I have a really good feeling about him. I feel that he can contribute this year.
I think the depth chart could look something like this:
Z: Niles Paul, Antonio Bell, Joe Broekemeier
X: Brandon Kinnie, Quincy Enunwa, Tim Marlowe
Y: Khiry Cooper, Will Henry, Stanley Jean-Baptiste
H: Mike McNeil, Currenski Gilleylen, KC Hyland
If Paul can consistantly play up to the level he is capable of and not make bonehead mistakes, he is easily one the top 10 receivers, possibly top 5.