I implore you to check out Rachael Price (and her band Lake Shore Dive). I've been a fan of LSD for a while now and have started to check out Rachael's solo stuff--I get the same feeling I got when I first heard Amy's voice and that I haven't had since (not with Duffy, Adele, or whoever else)
Here's her cover of "I want you back" with LSD that is starting to make the rounds: