IMHO, the obvious choices in your budget are the NAD "bee" integrateds and the Cambridge Audio 540/640 from their Azur line - all excellent choices!
I have to agree again with the previous poster - the PSB and Totems are your better picks because, as good as the Atom is, it won't deal as well with the demands of louder music (to be clear, the other two have their limitations, too!).
Try and sneak a little extra into your budget for some good quality speaker stands so you have the flexibility of optimal placement to the enhance imaging and soundstaging performance.
Good luck!
I have to agree again with the previous poster - the PSB and Totems are your better picks because, as good as the Atom is, it won't deal as well with the demands of louder music (to be clear, the other two have their limitations, too!).
Try and sneak a little extra into your budget for some good quality speaker stands so you have the flexibility of optimal placement to the enhance imaging and soundstaging performance.
Good luck!