Presumably you are taking this trip to see the world ? The best way to see the world is to take it easy, so why do you need more power ?

I've ridden against the clock on a long trip, it's rubbish and you'll regret it after.

Before deciding on the bike, decide on your priorities. If I were you, I would want to see the world pass me at a speed I can see it. Stop to take stuff in, a beer, coke, coffee, the locals, wildlife, photos etc etc. It's about finding a bike to fit the trip, so once you have the trip set, and the priorities of the trip than you can see what is important in a bike.

If you haven't already (and I'm sure you have) take a look at LWD (Ewan & Charlie), one of the breaking points was the constant clock watching and destination deadlines. If you think you need 2 days to do a section, allow 3, or even 4 and enjoy the journey. This type of trip is about the experience.

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Never underestimate the power of stupid people in large groups.