I am not usually much of a fan of Country Music genre but I *was* pleasantly surprised from a new band I saw last year that appeared and played on David Letterman Show, and is two brothers and their sister, "The Band Perry", insomuch I ordered the CD from Amazon before retiring for night.
it may not be a synth-based band but they play just about every old world acoustic instrument you can think of and the music is damn great. However, I am as well empty of suggestions of newer bands other than this and what's cool is it helped open my mind to that genre, even though I DO realize The Band Perry cross the lines of Pop and Country. here you go:
Live version of first song:
http://www.youtube.com/watch?v=IWw4wQ1MEtQ
Studio/Video of same song:
http://www.youtube.com/watch?v=ZIdCo_QAz_E
Different song, showing diversity:
http://www.youtube.com/watch?v=7NJqUN9TClM