Pete,
I'm looking at the SeaFinder 320DF. I recently bought a hand-held GPS for the boat already. I like the dual units like the SeaCharter, but my son wants to start hunting so I figured the hand-held would be a smarter buy.
I downloaded and played with the emulators from both Lowrance and Eagle. Hard to get a good assessment from just the emulator, though, like how they hold up to normal use, etc.