I can vouch for how good Local Natives are live and they are making the festival rounds for maximum exposure - everything from Isle of Wight to Coachella and Bonnaroo. Their voices are impeccable live, it is refreshing. I have heard great things about Phantogram's live show and have tickets to see them in May; they have sold out all of their shows to date in NYC. Beach House is selling out their own shows and supporting The National; their music is perfect for an outdoor venue at the witching hour. The Morning Benders are also selling out in NYC and have landed a pretty great opening slot for The Black Keys in Central Park. Finally, the Drive By Truckers are always a good show and if you get close enough to the stage, Mr. Patterson Hood just might give you a swig of the Jack Daniels bottle that is on their stage every night (which was my luck at a private party on Obama's inauguration night in D.C.)
Enjoy!
April and May are going to be big months too - LCD Soundsystem, The National, Caribou, Liars (check out their web site for a trippy video to accommodate their single Scissor - http://www.liarsliarsliars.com)