I also like the Schwalbe Marathon Supreme Folding Tyre. Very puncture resistant. Also don't forget the inner tubes. The Slime seal healing inner tubes also work well for those slow punctures.
A TREK 520 would work quite well depending on tires.
In the UK the Dawes Galaxy range is very popular. The Dawes Galaxy Ultra is a nice bicycle. It is expensive though considering the mid range Shimano components.
http://www.cyclingweekly.co.uk/reviews/touringaudax-bikes/dawes-ultra-galaxyi.e. The Reynolds 853 tubing will be twice as strong as the 4130 crome-moly tubing (equivalent to the old Reynolds 501 tubing)