You can ride around the world on anything - a couple years ago I read about an English guy riding around the world on a Honda C90 Cub...
Get a motorcycle that is very simple mechanically speaking. The Tiger is a good bike, but may not be as easy to get parts for as, say, a Honda when you're stuck in the middle of nowhere. Personally I'd get a Japanese 650 single if I were riding solo, say a KLR650 or an XT600.
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Bruce Clarke
brclarke@islandnet.com
www.islandnet.com/~brclarke