The Barf (or "Biologically Appropriate Raw Food") diet is described here:http://www.barfworld.com/
The Prey Model diet is simply feeding whole animals. Mice, birds, guinea pigs, rats, etc. Here are three sites that mention this type of feeding:http://www.rawfed.comhttp://rawdiettruth.blogspot.com/http://rawlearning.com/
The Raw Meaty Bones diet is detailed at this site: http://www.rawmeatybones.com/
Many folks who feed raw are passionate about their particular feeding methodology. Read as much as you can and make your own decision.
For myself, both BARF and RMB seem a bit too heavy on the bone percentages, so I won't use them. Whole prey would be ideal, if I could get my five to eat whole animals on a regular basis. I can't (right now), so I feed a form of "Frankenprey".
There is more info on this thread: TCS: Natural Diet Resources
Hope this helps!