First off, thank you for your post, ACt!
I agree with your named mangas as well. One Piece and Fairy Tail would be good and probably the most obvious choices to start with. They're pretty popular and many places already handle them the same way as Naruto and Bleach (like in the Big Three and Fairy Tail
As for the rest, maybe a poll would be good? I mean, collecting some names and links now, then making a post with a poll to get an overview, how many people would be interested to have which manga?