I have the Revel M20 and also the Dynaudio Audience 42 which I know is substantially cheaper but really holds its own. Not sure if the 140 shares the same specs as the 42 in terms of drive ability but the 42 is one tough cookie to drive. It will shut down my 100 watt Creek Destiny if I play them loud for an hour or so. The M20 does not have the same problem. I don't think the M20 blow away the 42 but I'd say they do sound better but there is a big place in my heart for the Dynaudio sound, it's just so easy to listen to.
2 other speakers I have on my list but have not heard but I would consider strong contenders in this class are the PSB Platinum M2 http://www.soundstage.com/revequip/psb_platinum_m2.htm
and the Paradigm Reference Signature S2 http://www.soundstage.com/revequip/paradigm_signature_s2.htm
2 other speakers I have on my list but have not heard but I would consider strong contenders in this class are the PSB Platinum M2 http://www.soundstage.com/revequip/psb_platinum_m2.htm
and the Paradigm Reference Signature S2 http://www.soundstage.com/revequip/paradigm_signature_s2.htm