That looks really cool in the 2nd one - black and white only. Rock on. or.. skank on.
The 3rd one is kind of cheesy because of how you did the shading - it looks like a photoshop layer effect and that almost always looks cheesy. And since the background is flat color, the monkey should be flat color as well, if it should be colored at all. But yeah, the B+W one owns, now all you need is a band and a catchy name.
I wanna get streamline.. that seems a whole lot easier than mucking about with anchor points in illustrator.