Any of the three bikes you linked to will do what you need. Trek is a good brand.
As for disc brakes, unless you have a specific reason for rim brakes, disc is far superior. They're easier to adjust (hydraulic disc brakes require no adjustments), aren't affected by weather, mud, etc, and are much more powerful, even after they wear a bit. You may not need the power for panic stops, but having strong brakes reduces forearm pump on long downhills.
Chris