With up to $6000 you have a near infinite amount of options. None of us can tell you what speaker will be your magic ticket. Everyone has their own opinion. The blanket "Maggies are what you want" statements are inaccurate and misleading. Yes, they can make an extremely holographic soundstage - but any planar speaker has serious issues that you need to decide whether or not you can life with, ie. disproportionate images, less-then-punchy dynamics relative to a box, non-setup-friendly, etc.
The above comment that "get tubes instead" is also misleading and inaccurate. As per your experiences, tubes have their pros and cons, but your plinius is a good amp, and is certainly capable of stellar soundstaging. 99% of soundstage comes from the speakers and their interaction with the room's acoustics.
You list some fine choices in your original post, all of which some will swear by. Except the B&Ws. LOL just kidding. Really, the best advice any of us can give you is to try and hear as many different speakers as you can, and don't put too much faith in what other people say "this is what you want".
The above comment that "get tubes instead" is also misleading and inaccurate. As per your experiences, tubes have their pros and cons, but your plinius is a good amp, and is certainly capable of stellar soundstaging. 99% of soundstage comes from the speakers and their interaction with the room's acoustics.
You list some fine choices in your original post, all of which some will swear by. Except the B&Ws. LOL just kidding. Really, the best advice any of us can give you is to try and hear as many different speakers as you can, and don't put too much faith in what other people say "this is what you want".