Hi,
I had considered the same options when we went to South America.
First point to make is that a GPS unit is nice to have, but by no means essential. Perhaps in more desolate areas like the Bolivian high plateaus etc, it is moire useful as a security device, but it should still only be considered as a back-up: they are not fail-proof! I still do most ofmy route planning and navigating using a map.
Having said that I like to have one for navigating in cities, finding my bike again if I park and go walking in the forst/mountain etc.
So I bought a Garmin Quest. It was handheld and motorbike, waterproof, internal battery/memory etc. However, I recetnly lost this and they do not make them anymore so I bought a Garmin eTrex HCX Legend.
The Nuvi 550 possibly has more options and if more sophisticated, but the Legend is waterproof, a micro SD slot for more memory, has auto-routing software, is small, tough, can run on AA batteries or you can wire in a USB to your battery so that it runs off the bike, when you are riding.
The only issues I have is that it the back light only stays on for 10 seconds at a time if it is not connected to the bike (I don't have the USB connector), so navigating around a foreign city at night can be a bit of a pain.
Other than that it's perfect for my needs.
HTH
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Adventure: it's an experience, not a style!
(so ride what you like, but ride it somewhere new!)
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