The 4 you have highlighted of the 5 left are the ones I like too. Percy Watson is just blah now, can't stand him.
I say push them as individuals though, they can all make it, Husky Harris is the standout for me though, Steve Austin acknowledges his greatness too.
Kaval will do well in the Evan Bourne entertaining sense but probably achieve very little long term, he could benefit from being teamed with Bourne, those two paired together in the tag division, they could have some awesome matches.
Alex Riley is like a Miz clone, he'll be an entertaining midcarder, I like him, but I can't see him progressing far past there.
McGillicutty is decent in the ring, and although he doesn't have as much charisma as his dad he is pretty solid, makes a decent tweener.