My dream speaker has the clarity and imaging of a kick-ass active monitor when listened to in the nearfield, with close to no driver distortion and diffraction from the cabinet, together with the ease and naturalness in the bass region of large speakers with oversized bass drivers. PLUS, they present a super clear stereo image, BUT fill the whole room with sound. That might be a tall order.
So I'll have to nominate three:
1. Morrison Audio, Model 19:
http://www.morrisonaudio.com/speakers/
I haven't heard them, but based on specifications and measurements (sent to me from the manufacturer) they seem to tick all my boxes - can be listened to in the near-field to provide a razor sharp stereo image, and also fill the whole room with an even soundfield as they are true omnis. And they're run actively and with DSP of course. Ideally to be used with two matching subs from the same manufacturer.
2. Oversized DIY horn speakers together with an oversized bass system, such as
these:
(what's not to like?)
3. A high end CBT speaker, which also combines the possibility for near-field listening together with room filling sound. Would like a model with much better drivers than the ones which are currently manufactured:
(disclaimer: I have no idea who these guys are)