what speaker new or used for 5k?

Vandesteen Model 2 or 3. They'll work great with what you have now, and will sound amazing as you upgrade your components to one's that will really bring out what the speaker are capable of.

Recently there were 2 pair of speakers I always wanted listed on AudiogoN for under $4k:

Revel Studio's

Unity Audio PARM's

Both listed for $15k or more new I believe ... NO idea how a systems like this would mesh with your current gear though but I do know you could sell the subs if you purchased either of these speakers

There are literally so many variables to speaker choice, that it would perhaps be wise to list some of the elements in a speaker that are important to you.

What do you want from a new(er) speaker that your current ones aren't giving you?

Soix hit the nail on the head, I'm looking for improvements in resolution, image and soundstage. something that's not too bright or laid back. its like the speakers I have are missing something not sure if its in the components or cabling?

You might consider making a change in amplification before changing speakers. There are higher resolution amps than what the A 21 gives you.

My suggestion is to try to get a few contenders at home for a trial, and see if there are improvements that do it for you.

Regards,

dan