#29 - #33 - I can't place my finger on it, but the people in this seem similar to another logo I have seen. It's a bit too "friendly" for me.
#34 - Super sharp! I love the stylized J's and that's completely different from what I was thinking about, but that's a really bad ass design!
#37/38 - I prefer #38 over #37 as I'm a fan of stacked designs.