I like the idea of combining recognizable features, although I think this way you might be loosing the chance to create more unique logo.

I really like the toned version (not really a fan of flat design), but I think your mono version should have thicker lines/boarders.

Also I just came up with an idea to make the IO in your mono version to look like a pictogram guy with his arms crossed on chest and make the rocket flame to be part of his body like http://www.comicbookmovie.com/images/users/uploads/8073/Cann... but keeping it minimalistic.

Somehow, I cannot fight the resemblance: http://fc00.deviantart.net/fs70/i/2010/231/7/1/Pokeball_Temp... :)