KLR650 if you are 6ft and above. Suzuki DR650 if you are shorter then that. The Suzuki is air cooled which is a great feature on a RTW trip.
The DRZ400 is also a good bike, but the seat height is tall like the KLR650 and the DRZ400 wont be able to go as fast on the highway.
The Yamaha WR250R might be your best bet. It has 6 gears and is a very capable 250 cc. This bike has sold extremely well. It has a tall seat height like the KLR650 and DRZ400.
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