Shimano XT components, 26/36/48 chainset with an 11-34T cassette at the rear
A further thought, Chris: On my current Eclipse touring bike, I've used a variety of der's & chainsets over the past ten years, and currently have Shim Deore's fore and aft, 24-36-48 at the front and 12 - 36 at the rear.
The ratios on this current setup work quite well for me. For example, the 24T small ring mated to the 36T cog at the rear (giving approx 18.3 gear-inches) allows me to pedal my loaded bike up some steep-ish hills (grade unknown, but I'd guess about 15%.) Depending on your use, that may be a lower low than you need. I've also found that the middle chainring at the front suits for about 90% of my riding unloaded, & about 80% when loaded.
I've had recurrent derailleur adjustment problems over the years, however, with both this and other setups--at the level of serious nuisance rather than catastrophe, happily, but enough to exhaust my patience with the device. It's largely for that reason that I'm having a New Raven-with-Rohloff built this Jan/Feb (with gear ratios which give me a couple of gears below my current gear-inch low.) The Eclipse will be "retired" to day rides, lightly loaded or unloaded. Dan's generous and informed advice has helped me greatly to get a better adjustment on my rear der (the main source of irritation in the past). And interestingly, Graham Smith in Australia (a Sherpa rider) has also observed that he's had no major problems with Shim products beginning with "X". So, good luck with your XT setup!