I love, love, love Patty Griffin. I'm not familiar with three of the singers you listed; I'll have to check them out.
Some others I like: Neko Case, Cat Power, Sarah Harmer, Feist, and Gillian Welch--for women. I also like Sufjan Stevens, Bon Iver and Josh Ritter--for men. I just got The Civil Wars cd, Barton Hollow. It's very good if you like some harmony.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher