Which speakers to be ''in'' the music?

I am not going to belabor others points above.  Yep.  

Check out Raidho.  They deliver a massive and immersive soundstage.  Even speakers as small as the X-1s assuming your room is setup correctly.  Scansonic does this as well, just not quite as effectively (same company).  I enjoy their stand-mounts with a subwoofer.  

Audiovector - has a rear firing tweeter in their smaller (R1 and R3) models.  This offer a wonderful experience.  You ought to be able to find the older RS 3 model in this range.  

Magnepan, Martin Logan or other electrostat/planar panels.  The only thing to note is these like power and depending on the speaker, amp matching can be interesting.  Magnepan is warm and like brighter SS amplification.  Martin Logan is cold and needs neutral to warm amplification.  

The ultimate speaker for this experience is MBL.  I doubt you will find one used in that price range.  

You definitely need to listen to at least one brand of omnidirectional loudspeaker, to discover if this is, generally speaking, the kind of effect that you are looking for.

+1 for Magnepans

My 2 cents:

Their SQ / $$ ratio seems very high.  Driving them with 220W per channel, the soundstage and imaging is impressive.   

They sound OK anywhere in the room, but when you get in the sweet spot, the music transforms into 3 dimensions if it was recorded well.  The speakers need a lot of air around them, they need about 4 feet from any wall.  

I have only auditioned these against B&W and Goldenear, and we all know there are better sounding speakers out there.  From what I have auditioned and researched,  they are hard to beat for the price.

The brand that is always true to the music and gives most of bang for buck  is Totem from Montreal . At least of the hundred I have tried .

Maurice,
ca va?
your English tres bien