Integrated amp recommendations

Have not heard it yet, but reviewers have been all over the NAD M-33.

check out some of the reviews. 

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