Thank you all for the feedback. Here is my follow-up after a couple of years of researching (procrastinating.)
I found Yamaha TSR-6750 on sale a few months ago and decided to purchase that. Today, after finally moving my old Yamaha RX-V850 upstairs and having listened to both for comparison in a room without much furniture on a wooden floor, I can safely say TSR-6750 is a good replacement.
Although I'd have liked RX-A1040, it looked like RX-A850 was more equivalent to RX-V850, and TSR6750 had similar power to RX-A850 with less connectivity. Besides, I couldn't refuse the low sale price of $420 (for MSRP$850) that included a separate wi-fi adapter. It has an option to set 6-ohm, and the dynamic power can go up to 240W at 2-ohm, so it was enough to drive my Kappa 7's. The old one will still drive Kappa 7's, and the new one will drive Polk Audio SRS-SDA 2B, but I'm very satisfied.
It took about 4 months total duration to rip all my audio CDs (sadly I found 5 scratched CDs that publishers no longer make.) I'm happily listening to my flac music collection over ethernet from a mediatomb DLNA server running on Raspberry Pi with 32GB USB stick (enough space for my critical collection.)
One thing I noticed is that all new Yamaha receivers has a power rating using 0.06-0.09% THD, but my old RX-V850 has power rating using 0.015% THD. This probably doesn't mean much since it seems that at a range below 0.1% THD, the difference is pretty much inaudible. But just curious.