Something better than Marantz PM7000N at around $1000?

7000n probably best thing for $1000, yes. I own one and it’s great.  One of the Brit mags declared it best under 1k

Considering just the sound quality, would B1 + int amp (near $1000) be at least as good as other int amps with a built in BT?

The maximum sound quality of Bluetooth is pretty much the lowest of all digital inputs. I think most BT receiving circuits and chips are generically implemented at the line-level, so the variable performance of BT (e.g. B1+amp x vs BT-capable amp y) is likely to be trivial when saying which amp you prefer overall. That’ll come down to power supply, the transformer, component quality, gain stages design, compatibility with your speakers. Home demo + your ears are the best way to decide which amp is best for you.

Thanks for the info.
Looks like I can go for either Marantz PM7000N or Yamaha R-N803.

Hey OP, what did you end up going with by chance?  Were you able to do a comparison?  I’m currently stuck between these two choices myself.

With further research, I’ve decided to stay with what I have:
Use Denon HT receiver for computer audio, and use Bluetooth connection for streaming.
My listening is still 90+ % from CD and LP, and I am slowly listening more from wireless and digital file. I’ll wait another year or so for WiFi/Bluetooh/USB receiver. I'll probably go for WiFi/Bluetooh/USB preamp.
If I were to choose, I would have gone for Yamaha because it has more power and cheaper.