Vandersteen 2/3 vs. 3A MM de Capo vs. GMA Europa


I would like to upgrade my modest system:

Squeezebox (stock) playing FLAC files
Rogue Audio 66 Magnum
Threshold S/200
Onix Reference 1 monitors
ACI Force XL subwoofer

I have a large room, about 14' x 28' (somewhat irregular shape) that is open to another room and a corridor.

I think that speakers would be the best upgrade at this time and the three I have mentioned in the title are high on my list (I haven't heard any of them so it is based on what I read here). I’m interested in other suggestions. The budget is $1500- $2000 used, depending on whether I need to keep the subwoofer.

I often listen to music many hours a day so non fatiguing sound is important. Also I don't always listen from the sweet spot and I would like speakers that sound as good as possible throughout the room. I often listen at night at lower volume. I listen to all kinds of music; almost everything except orchestral and hip-hop/rap .

I’m new to this hobby and I’m not sure I know exactly how to describe what I’m looking for. I want a more room filling sound and for the speakers to disappear (that is sometimes a shortcoming of my current system). I like details and good imaging.

I should mention that one of the reasons I’m considering 3A MM de Capo is because I might want to try a tube amp in the future so higher sensitivity speakers would be useful.

Am I on the right path thinking about the speakers or should I consider changing the electronics? I would appreciate any specific suggestions but also general advice how I should go about the upgrade.

Thanks,
Adam
sapek
The Vandersteen 3A sigs will make most sense and fill that room best.
The Vandersteens offer lofty drivers are full range phase and time correct from a great company that answers the phone real time.
Would my Threshold (it is 100W/ch) be enough to drive the 3A sigs? Is the room too big for 2ce Sig? I read they are easier to drive.