Upgrade entire system, speakers first

Maybe the Green Mountain Callisto would be good, the sound amazing, just not sure if you will be far enough away from them (1storder crossover) but others will chime in.
Also look at DK Design for Integrated, tube pre and SS amp built into one, even has a Phono stage at a great price, and it sounds really nice.

Artch, where are you located?

What larger - presumably unaffordable - speakers have you heard that you do like?

Have you considered just moving up the PSB line, or are you looking for something significantly different?

Duke

Looking for something completely different. I did hear a pair of Wilson Sophias and liked them.

Artch, thanks for the additional information.

Okay this is going to sound completely nuts, but...

I suggest you completely re-think your projected dollar allocation, and hold out for a pair of used Wilson Sophias. That's an excellent speaker, and Wilson Sophias driven by three grand of integrated amp & CD player will outperform just about any four grand speakers driven by six grand of electronics. I say this as a builder & seller of four grand speakers.

Once upon a time, years ago, I sold virtually everything I had to buy a fourteen thousand dollar pair of electrostats. I drove them with a $350 amplifier. Yes it was mismatched, but it was the best sound I had ever heard in any stereo system up until that time. Of course things improved when I bought more expensive amps, but if I had $14,350 and no more to spend on speakers + amp I'd go back to that combination (okay the prices have changed since then, but I think you get my drift).

I know a recording engineer who used Watt-Puppy 5.1's driven by a $600 amp, and he produced some excellent jazz recordings.

Best of luck to you!

Duke

Speakers are the most important, build arround the speakers.