Sorry, yet another

I'm looking to take my system to the next level, and I'm a firm believer that speakers are one of the most important components for reproduced sound to sound like the real thing.

I'm looking for speaker recommendations in the $6k or under range (used / demo) that can replace my Von Schweikert VR-4 III HSE. These speakers do a lot of things well, and I don't want to lose those qualities, but I want to improve on a few perceived shortcomings (on to that in a second).

So if you have experience or have owned the VR-4s, lay it on me. What did it take to get better sound, and the next level?

But first, my system consists of:
- BAT VK-D5 CD Player w/ Amperex 7308 tubes.
- First Sound Presence Deluxe MKII preamp, also with Amperex 7308 tubes.
- Either Parasound Halo JC-1s or ASL Hurricanes monoblocks (have both, haven't decided on which to keep yet).
- Audience AU24 ICs and speaker cabling, PowerChords

My room is around 25' x 20', and speakers can be placed up to 4' into the room (measured front of speaker to wall behind it). I also have three dedicated 20A circuits.

Listening preferences include a lot of acoustic and electric blues, jazz, female vocal, classic rock, older hard rock, and limited classical.

I like the way the VR4s image (holographic soundstage, detail, somewhat forward presentation), their great natural midrange, airy highs and deep bass. I don't like the shorter soundstage I get and the lack of chest pounding bass slam when called for. Dynamics could be improved a touch as well.

So am I asking too much? Does such a speaker exist, whether dynamic or panel and under $6k?

Note: I haven't spent much time in positioning yet as remodeling is hampering those efforts.

Thanks for the help!