I am Looking for That Elusive 3 Dimensional Room Filling Soundstage


I have heard it half a dozen times at home, small room, Primaluna HP Integrated or a Rogue Atlas Magnum II and RP-1 Pre and believe it or not a pair of close to 30 year old Paradigm Export Monitors.

The experience I had, I can only describe as sitting in an aquarium when the litlle rectangular glass aquarium was filled with liquid engulfing you from all directions with no awareness of the speaker boxes...it was just perfect!

The room is approximately 12 x 13 x 9, small bedroom converted to a den!

So the question is what speakers does everyone recommend to provide the same experience?? I have a budget of $2000 for the next little babies so let’s not talk about Focal uber expensive stand mounts at $9500 thank you!

Monitor not floor standers and the Primaluna is gone, it’s all Rogue And yes, I would consider a pair of floor standers that are not to intrusive.
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or you might pick up some Owens Corning 703 and make make some acoustic panels 
All fascinating stuff, I am liking the Ohm Walsh ideas after having read ad nauseum about them first and then the other speaker that caught my eye is the Graham Chartwells, and possibly a pair of KEF LS50's but not sure about them.....Comments on the KEFS?
A number of people have mentioned room treatments.  I agree.   In an untreated  room with those dimensions, you are going to have a confused mess from early reflections that really frustrate any attempts at achieving your goal.  I spent a lot of money and effort chasing better sound not realizing how important the room is.  For me, utilization of REW to discern room issues has been a game changer.  My room is still under treated, but little by little I add more treatments as I figure out where I can make the biggest impact.  I have no intention of changing any of my current equipment until the room is where it should be.  
Another + for room treatment. The room and setup gives at least 50% of what you will hear. Not magic, just physics.
Room Treatments, I need a primer!
How do you decide what treatments to do, where does one buy it, how does it look (WAF) and what will it cost? Educate me,  I’m pretty good with physics!