Following. Was just headed here to ask the same thing. Hope you don't mind me hitch hiking with some ?s of my own.
I personally had the Rhino before, but I never used the function where you can link up with other people. So I'm not sure I see the benefit there.
I am leary about touchscreen. Never used one before, don't know if they're ok. The Oregon, Montana, and eTrex look appealing due to a larger screen.
Also, do you need any special software for these? I see some are preloaded.