I like where you are going with both #6 and #5. I dont really like the font style, perhaps try different font styles but the font treatment is good. Some colour choices would also be good. The whole thing feels a little too 'Ninja' at the moment however the overall idea is on point
I like both designs. #34 has got a great vibe. Not a fan of the font but the subtlety of the tornado in the back ground is cool. If this was built into a shield of some sort it might look cool. Overall tho its a font issue with me. most designs that have been posted are using a similar futuristic font, experiment with versions that have a variety of font styles.