What is the best camera attachment for the iPhone 4s?

I want a camera attachment for the iPhone 4s. I want good zoom and good quality photos. I want to spend $50-100. Possibly a little more. Which is the best one to get?

The only add-on lens attachments do not include an optical zoom.

Here is a link to some high quality add-on lenses for the 4s

http://www.iprolens.com/about.php

Http://www.bhphotovideo.com/c/product/893195-REG/Hasselblad_H5D_60_DSLR_Camera_With.html

If you attach that to an iPhone 4S, you will get excellent quality photos. Zoom, none. Cost, a little more than that but this is undoubtedly the very best money can buy.