Hope it's not too late but have you considered the XT600E? Aircooled, pretty much indestructable engine, and built until 2004 when the XT660R hit the shelves. A bit more vibey than the 660 engine, 2hp less (46hp vs. 48hp), not sure about torque. I've owned a 600cc 3AJ Tenere and have nothing bad to say about the engine or the bike in general. The fuel pump on the 3AJ model was crap but I ditched it during a roadside repair in heavy rain in eastern Poland and replaced it with a gravity assisted non-mechanical non-electric non-hydraulic rubber tube. As far as I know the XT600E doesn't have a fuel pump plus you can actually add a kickstart, which is impossible with the watercooled 660cc engines.
I bought a 2009 XT660Z Ténéré in October 2010 after selling the GS and already there are a few things I don't like about it, and a few design choices I cannot fully understand. Like having to take off the side stand in order to take reach the gear lever screw... Other than that I haven't had it long enough to either recommend it or warn you about it, but if reading on the specific bike/brand forums is any sort of indication of what awaits me then 
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