Although I much prefer Garmin devices, and I also have a Zumo, I think you would be better off with a TomTom Rider. This is because you can download maps for all the different countries of the world at no additional charge from TomTom. You can't do this with Garmin without spending a heck of a lot of money on maps.
I have used a TomTom Rider 550 in the past. It's not the greatest GPS device in the world, and there's a bit of a steep learning curve to get used to it if you are used to Garmin (kind of like switching from Windows to Mac or vice-versa), but I think it would be the best choice for a RTW. It's also small enough that you can easily disconnect it from the moto and stuff it in your pocket when you dismount.
Mcihael
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