The Excalibur is the ONLY dehydrator you want for raw food preparation.
Personal experience: I purchased a cheap dehydrator to save money (some brand from WalMart, I forgot which, doesn't even matter). Made the pizza crust. It was moldy. We weren't sure it was ok, ate it (yeah. stupid.), and spent the night projectile vomiting.
They don't dry from two directions like the Excalibur does - the Excalibur is really engineered for safe and efficient drying (not just the two directions part, but the way the trays are set up for optimal air flow, etc.). The other brands are just for hobby stuff like drying apple pieces or really basic stuff.
So I hate to sound like an advertisement, but the Excalibur is really the only way to go
If you're eating raw, then you don't want anything else, and it's totally worth it to save up for it.