I test rode the 920 and it was a fun bike and had some cool stuff that I dug but I wouldn't rate it in my top touring bikes. If I had to go with a touring bike from Trek it would be the 520 (though I wouldn't go with Trek) but if I wanted one of those sort of adventure touring bikes I would probably go with the Specialized AWOL EVO, that thing has some pretty sweet details that are great for touring. Steel frame for a comfortable ride, Supernova dynamo lights and Plug (with a cool bar end switch) 32h wheels, TRP disc brakes (HY/RDs so you can run cross levers), Tubus rear rack and comes with fenders. It has some similarities with the 920 but I think overall is a better package for the money. If the 920 was steel I might rate it a bit higher but I would still say the Specialized is a better bet.

However for the best bet before total custom is Co-Motion. They make all sorts of different touring bikes with different configurations and have been doing so for quite a while. They give you a ton of options if you want 29" or 26" or maybe classic 700c, IGH or derailleur...I think spending the extra money and getting something nicer is always a great way to go if you can afford it. If not start off like I did with a Disc Trucker or something like that and upgrade when you can.