Integrated amp recommendations

Rotel Michi X5
  
https://parttimeaudiophile.com/2020/08/17/rotel-introduces-michi-series-x3-and-x5-integrateds/

YG caramel are great speakers. Of the choices you mentioned, I have used Naim uniti nova and loved them. They are very very good and you will not be disappointed. I sold it and sometimes I regret selling that. I wanted to go class A and now have luxman 590axii and they are different level. Even though it is rated at 30 watts, they are more powerful and they can drive caramel easily (they can drive most speakers with sensitivity > 86) as long you don’t want it very loud. I am now using luxman 590axii with lumin t2. Depending on your budget you will love the combination of luxman 590axii or 509 with lumin t2 or x1. I think the sweet spot will be to get 2 units (integrated amplifier with streamer/dac) rather than going all in one or all separate. 

you want rich and sweet sound you haven’t included tube amplification as a potential option (or is the luxman you mention one of their tubed units?)

i don’t know your yg speakers. don’t know if they rule out tubes

prefer solid state

The NAD M33 is a good option and I think will sound good with your speakers.   

This is where I would normally recommend something from AVM but the only unit they have available at the moment is the CS8.3 which is $15,400 MAP.  I think it would be amazing with your speakers.  The CS5.3 and 2.3 which are in the sweet spot of your price range are delayed till next year due to COVID 19.  

Maybe something from Primare?  They have modules that go into the I25 and I35 Prisma units that should give you what you are looking for in terms of functionality.  Not sure how it will sound with your speakers though.  

Full disclosure, I am an NAD and AVM dealer.  I have not relationship with Primare.  Unless a dealer has stock on the M33, they are out-of-stock till the end of the month.  I have a few on order right now.