Improve sound

You can get a Parasound 23+ ( assuming used) for a $1,000?

Upgrade the room first. There's always something you can do to improve the room. It plays the biggest roll in the system's sound signature.

Many here know this but really hit a wall (pun intended) and never fully exploit the room's potential, myself included.

I learned by sheer accident after years of believing I had done enough. 

Room treatement is the most important upgrade for electorstatic speakers. Since I have owned ML  -> Quad -> Stax -> Sound Lab A645, I think that I have some experience with this subject. 

The room acoustics and the setup are the biggest contributors to the sound you hear. If they're not right, no gear change can help that.

Go to an audio show.  You would be surprised that really expensive speakers can  sound crappy in an untreated room.  Get some absorption panels and experiment with placement in your room.