Looking for an integrated amp around 4000 to 5000.

Audio Research made some--50 and 75, I believe.  You might want to check them out while seeking one for your system.

Cheers!

@pal   

I am looking for a greater sense of presence in the music. More body in the vocals and space between instruments.

This part is very helpful - now we understand what you're looking for.  I actually think your speakers are holding you back from achieving this much more than your amp.  Those Ascendo C8's are not necessarily the fastest nor the most dynamic (particularly at lower volumes).  I would opt for a speaker change before considering an amp switch.

Hello - wow you got some kind and sincere responses and some odd recommendations but that’s to be expected. Folks on this site for the most part are kind and want to help you. 
Ok let me try to help. 
First things first. Over the years I’ve owned many different speakers and many different kinds. Bookshelf’s, panels. Single driver, Electrostatics, full size the works. I owned these Ascendo C8’s for years and loved them. I bought them right after owning a pair of Wilson Sofia 2 and they are much better IMO. That rear firing ribbon tweeter is odd and I never used it but some people like it I guess. 

So the challenge with these is similar to the pair of Martin Logan Summits I owned. To get the bass driver to match the panels speed and blend properly. 
Your speakers have an internal base driver that honestly I worked hard to find a good match. I first tried tubes CJ, ARC, PL, etc.

Then SS. Pass, Krell, Mac, Ayre. 
Here is the thing. They need / demand driver control / high damping factor. Give them the best driver control and juice you can afford. 
I now use Magico S5 MKII and these respond best with Soulution and Vitus IMO. Both grab and hold the drivers so we’ll. Of course there are other great matches. 
Your speakers have some warmth to them so I recommend SS for sure. 

The 88db / 6ohm is not what to look at really. The better driver grip the more your internal driver will march that nice mid and tweeter set up. Focus on the amps grip. Trust me. Get the highest damping factor you can afford. Watts help but damping factor will lead you to the promise land. 

Forget about brands or recommendations. Get a high quality SS amp with the best driver control / damping factor and you will thank me. I tried a dozen amps to get these right and difference was night and day. 
What is your budget. 
For example for my Magico S5 MKII I was using Pass Labs XA160.8 with damping factor of 200. Pure class a, warm great amps and I was happy. My Magico’s are no where close to relying on damping factor specs compared to the C8 but as a rule Magico’s really want their drivers held petty tight. My Soulution 530 has a damping factor of 10,000 vs the Pass Labs 200. Nelson keeps them sort of loose and that helps give them that warm, round and inviting sound.

With my Soulution I unplugged my pass amps and plugged in my 530 and let it warm up for a couple hours playing Roon radio and did some yard work and came Back in and had a listen and was blown away. The Pass Labs class a monobocks were gone in less then a week. 
The 530 is a very expansive amp but still for Ascendo C8 you need to get the highest damping factor you can afford. 
Now I’m not saying this is the only spec that matters. Get the best quality SS amp with the highest damping factor you can afford. Watts mean nothing really but can help. My Soulution is 130 watts and blew away a 450 watt amp so please do your home work. 
Maybe some folks on here know of a good high damping factor amp that sounds great in your price range. 
What is your budget? 
Will you consider a used amp? 

Don't  worry about damping factor to much.

http://diyaudioprojects.com/Technical/Papers/Damping-Damping-Factor-and-Damn-Nonsense-Floyd-Toole.pd...

Entertaining how everyone has zeal for particular recommendations,  given the fact that they have zero knowledge of how it would integrate.  Like betting on horse races.