next step up from my ps audio sprout ?

What improvements are you looking for and what sound characteristics are most important to you?  Are you looking for new or used?

The PS Stellar Strata just sold out of their closeout sale, but if you like the Sprout the Strata closed out under your price point...

soix 

I am looking for just a little more power and depth and resoultion 

Jl35. 

 shoot I did not know that would have been a logical step up 

New or used?

Soix 

New or used does not matter 

Was thinking the Musical Fidelity M5si ($2199 at Audio Advisor) might be worth a look as it’s got good power/current with a lot of grunt and tonal density the KEFs would probably welcome.  Downside is the USB input only goes to 24/96 but that’s still pretty good resolution, and it doesn’t have Bluetooth onboard but it’s easy enough to add it for little $ (requiring Bluetooth built in greatly limits your choices).  Here’s a review that goes into more detail on the sound, and I think this amp may be a good sonic fit for what you’re looking for and a good fit for your KEFs.

https://www.13thnote.net/2020/10/30/musical-fidelity-m5si-integrated-strongman/

Retracted

I would put this Vincent at the top of your list. @mesch can testify.

This doesn't have everything you list, but Rogue is a good brand, I hear, and you could add on the bluetooth/streaming. Here's one for $1000

This Hegel would have more, and also almost fits your budget. And this Hegel definitely does.

Give PS a call, they might have a cancellation or be able to 'find" one for you...

Look into changing power cords, interconnects and speaker cables. Check out Ali-Express cables Odin 2 Gold are really good and won't break your budget

Wow so many suggestions I hadnt even considered,  Thanks so much I am researching them now.    Should I consider a peachtree integrated? 

Ps also any Japanese recommendations?   I am going to Japan in a couple weeks.     thanks again