I never heard ATC speakers. However, as far as I know, there are studios who utilize B&W speakers for monitoring. Lucasfilm THX being one of them. Or at least they used to be.
In any case, it looks like you're looking for a nice monitors. if you have a powerful amplifier(capable, with quality power not just numbers, around 150w/ch and up) you may want to consider Totem Mani-2 Signature. These are full range monitors that go down into 20s in the bass. Real good sounding speaker. Revealing. uses Dynaudio drivers. Very impressive speaker. My second choice would be the 805S. You will hear plenty of detail with either speaker. B&Ws however may sound a touch fuller in the mids.
JMO.