Chris--The first thing you need to decide is if you need an LCD. You'll pay almost twice as much for the same size/speed if you want one of the models with an LCD. But if you don't have a laptop then an LCD may well be worth it for checking exposure, deleting rejects before you get home, etc.
I lead photo safaris to Africa and all of those brands have worked for people. Epson is a solid if not exotic choice where you pay for quality and the brand name. Jobo is a little more cutting edge. Digital Foci & Nexto units often come without LCD so they can be much cheaper but of course you can't view your images. So each has its place.