I'm glad Magnificent is the next one -- it should have been the first single. Very poppy, with opening keyboard notes that are all the rage these days (Killers, Coldplay etc), and then that huge WHOOOSH of sound once things get underway. And I think it's safe to say that Magnificent is the "best track" on the album according to U2 diehards, as shown by the non-scientific polling on this site, at least.
After that, definitely Breathe. It still sounds a little too adult-contemporary / "Dad"-rock for my liking, like much of HTDAAB, but people seem to love it, which is the important thing.