I think it sounds really good, excelent song. The singer has an awesome voice.
As for the mix, yeah the drums need some work and overall the song seemed slightly too loud (the spectrum analyser in winamp was going off the scale!). I dont think theres any major problems with the vocals, they sound really well placed and up the front of the mix, like your attention is drawn the them, but still not over shadowing the rest of the instruments.
As for the 'sucking air breathing noises'.....They should be there, they give the vocals more character, listen to any song by 'Muse', the singer does exactly the same thing, and they left it in there for a reason.