I think logically the second single should be Private Radio, since it was originally going to be the first one, but I'm hoping it'll be San Francisco or Who's To Say, I think they could both do very well (and they're my favourites!)
About the Streets Have No Name thing, I see where Rosie is coming from. It's not that the cover isn't good - which it is! it's brilliant! - it's just that a) if she released that as single she'd be eaten alive by critics and b) she has much better songs (her own songs!) in the album that she can release instead of that and cause a much better impression. Just my opinion.