IAP logo poll--looking for feedback

Need help deciding. My son-in-law, who does graphic design, has worked with me to develop a professional logo for my corporation (the Institute for Applied Psychometrics - IAP). After a number rounds and iterations, we have it narrowed down to the following six. As you can see, the logo includes the greek symbol associated with psychology (Psi) and the normal curve.

I would like feedback from my readers. The pool is at the top of the blog page on the left margin. "Comments" are also welcome.

The selected logo will then be integrated into a separate logo for "IQs Corner"...the nickname for this blog.

Thank you in advance for feedback. Double click on the image to see a larger version.




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