I see a few problems with the Cresendos, one if they have too much bass they will most likely overload this room speakers which go to the low 20's need a much larger room to not overload the room with bass.
I heard the Cresendos at CES a few years ago and I was not blown away at all, in fact I thought for a Chinese made product was was too expensive for its build quality which was good but not stealer.
The Marten is a much better speaker in terms of both driver technology and build quality. Ceramic drivers can be very transparent and fast but can sometimes sound a little too bright so setup is crucial. This listener values warmth over transparency and the Marten may be too much of a good thing.
Tannoy's are very dynamic and punchy but I don't find them really coherent or that transparent, and sound staging is good but not amazing.
Aerial I haven't heard nice speakers but I don't really think they are that special.
The Dali Epicon's are new and are getting rave reviews in Europe how they stack up is up to the listener, they have some very interesting new driver technology, which is said to dramatically lower distortion and they go low enough to be punchy but do not go low enough to overload this size of room, in addition they are stunning to look at and come from a long standing well established company.
The Dali's tonally are warm yet have some good detail in the top and have punchy bass and a huge three dimensional sound stage.
Unfortunately the Dali's have yet to be reviewed in the US yet, however, in the Absolute Sound buying guide there was a snippet review which was very positive.
I am a Dali dealer and we just got in a pair of the Epicon 8 which are getting burned in, right now they are sounding very good, but it is still too early to tell if they are good, great, or truly amazing loudspeakers.