I don't have a good idea of how well known these guys are, but it's the best I can think of for now. Their name is fun., and they have the whole indie pop/rock thing going on. Nate Ruess (the lead singer, formerly of The Format) has an awesome, unique voice which, I think, makes the band special.

At Least I'm Not as Sad (As I Used to Be) is the song that got me into them. If you like Panic!, they're currently touring with them and the two bands have collaborated on this song: Come On

Another band just came to mind, too, even more fitting for the topic - Heartless Bastards. They're pretty small, but damn are they good. I'm just gonna let them speak for themselves. I think you'll like these guys, Phil.
YouTube - ‪Heartless Bastards Out At Sea‬‏
YouTube - ‪The Mountain - Heartless Bastards - Lyrics‬‏
YouTube - ‪Heartless Bastards - Hold Your Head High - HearYa Live Session‬‏