I did some searching for you, and it's a bit difficult to find good information on good slow motion camcorders. However, JVC brand camcorders were coming up in my searches most often, and it seems like they tend to have the best slow motion functionality.
Here's the first one I found that might be good for you:
JVC Everio GZ-HM400 High-Definition Full HD AVCHD Flash Memory Camcorder with 10MP Still
Here's a link to an article that explains its slow motion feature:
Here's a link to Amazon with more info an positive reviews. It's somewhat expensive, though, currently selling for 729.95 (27% off).
I also found this one, which might also be a good option for you
JVC Everio GZ-X900 AVCHD HD Flash Camcorder w/5x Optical Zoom
It's currently 499.99 (44% off)
I hope this at least helps you to get started looking in the right direction. Feel free to check out http://www.MiniCamcordersBlog.com for more camcorder info, though I don't have anything specific to slow motion camcorders posted there presently.
I'm looking for a camcorder with clean and clear slow motion playback option. It must be clear to break down athletic training situations. Have any suggestions?
P.S., this camera only needs to be medium to entry level....