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

If you go the route of using a separate dac/ streamer, try the Naims. Even the entry level model has great sound. 

The Hegel H590 is 300wpc and $11k new. Open box around $8k. Reviews are very good. The H390 seems to be the better deal at 250wpc and the same dac and features. It is $6k, but it can be purchased closer to $5k. I recently upgraded from a NAD C388 to the H390 and I absolutely love the H390!

I own an Aesthetix Mimas with DAC and phono modules. Excellent integrated and under $10k. 

The reviews all said the 390 was great for its price but that the 590 was on a different level, and the 590 is well within the budget, so might as well get the best for the money willing to spend. If wattage was the only difference and didn’t feel the need for then that’s different. Having said that it sounds like speakers arnt set yet and I do believe I saw Maggie’s 20.7 mentioned as a possibility( they can suck up lots more power than 300 watts no problem) And also that he was looking to go with efficient speakers so much this time. Based on that, I’d look into as much power as possible, and for anyone who bass is a big deal, the more power, the better the control over the bass. 

Yes! Mimas was on my list as well. It's class D, but has tube pre stage so might work. I will check it out.

Isn't the Gryphon 300, 22K? Might have to look at used.

Yes, if I look at Hegel it will be the 590. So I won't have to wonder what I am missing out on.