All-in-one integrated, 10-15K range, class A/B only

@essrand   I realize this is for a secondary system, however, at the price point you've stated, something has to give. And that something will be the DAC module (most likely). Adding a streamer only complicates this equation by adding another (compromised) variable.

I'd personally approach this with the "all-in-one" component as the Source to Pre component. For example, the Lumin X1.

In keeping with your pre+amp approach, Vinnie Rossi's L2i comes to mind, but it is above your budgeted amount. He offers a DAC module but that takes the overall cost north of 20K new.

Throwing this into the mix, on the off chance it applies, since your speakers are TBD...and this is a secondary system...

Significantly under budget, intriguing and a very different type of All-In-One is Buchardt Audio's new A700 or A500 with Hub. 

https://www.buchardtaudio.com/products

Electrocompaniet,YBA Audio,Mark Levinson,Mcintosh MA-5300 & Unison Research ALL offer world class sound with all the features you are looking for...

Maybe you can look at the Krell 300i with dac module under $9,000?

http://www.hifiplus.com/articles/krell-k-300i-integrated-amplifier/

Check out the Boulder 866.

The problem with how the OP stated his question is that he specified a price floor.  It reads that he won't consider products that cost less than $10k.  Why?  I don't know.  Is that amount some magical demarcation line of quality?