"Frater, momento mori?" "Never reformed, because never deformed?" I spent my semester abroad housed in a 14th century Carthusian monastery in the eastern (=older, softer) Austrian Alps - gorgeous setting, very peaceful still today. It had it's moments during the Turkish assault on Vienna, but you'd never know it now; and the so-important outer wall is a crumbled ruin.
For my pick, either a Franciscan order or one with a similar eye towards poverty - simplicity if you like - and service.
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For men are homesick in their homes,
And strangers under the sun,
And they lay their heads in a foreign land
Whenever the day is done."