Hoping for a recommendation for stereo amp around $1500 or less ($2k max)

I should have mentioned in the title I want new with warranty. Sorry about that.

Thanks for the idea about xlr/rca out simultaneously. I wasn’t sure that would work. I’ll also read up on the A21 as well as the amps from the first post since it’s not necessary to have line out on the amps.  I wasn't sure it would work since I thought balanced out had more gain than rca and it might goof up the volume ratio between speakers and sub at different volume levels.

Thanks for the advice.   Those look very nice but I would want a warranty at this price.  Also, I don't see a line out for my sub.
What about the NAD C 298? 
https://nadelectronics.com/product/c298-stereo-power-amplifier/It has those purifi modules I keep reading about like they're the next big thing.  Supposed to be efficient and just the right amount of power.  Also has gain control and line out.  Just testing the waters a bit.

Thanks everyone for the suggestions.  I have a lot to think about.  Has anyone tried VTV amps before? They have one for amp $999 with purifi modules and it's supposed to be super clean and strong at 4ohm.

Thank you for the extra info.  I would be going out the back of the A90 amp since the balanced out on the D90 is already taken by the cable going to the A90.  I assume the result would be the same.
I've noticed lots of bel canto recommendations for older units.  This has me wondering if I should save a bit more for a new bel canto unit since they seem to last a long time unless I'm mistaken.  I don't mind spending a bit more for something that's going to last decades and is easily repaired. 

Would you say bel canto is a quality brand with good quality worth saving for?  I've seen some questions raised online about NAD build quality and VTV build quality but haven't heard anything bad about bel canto yet.  It seems like they're the amp equivalent of and old toyota that won't die but with the performance of a sports car.

First impressions are very good. I was a bit worried until I realized I had to reverse the phase on my sub and then suddenly theeeere it is. It went from clear but hollowed out to clear and fleshed out and warm and delicious. I had to look up the specs on my speakers to realize they go down to 40hz and I was getting overlap in the low frequencies combined with being out of phase.

Now that it’s about 80-90% dialed in with the sub I’m extremely impressed. I feel like I got a hubble telescope for my ears that lets me hear the universe. I don’t notice any excessive high frequencies like I’ve seen mentioned in purifi threads here but then again this is the newer model with a different opamp. So far very happy but still learning.

After much reading and deliberation I ended up giving in to my curiosity about purify. I got the vtv eigentakt eval 1. Everything I read about it suggests it’s the full size speaker equivalent of my A90 which I like a lot with my phones. Audio science review showed it performing in a similar way as the A90, basically making everything else look silly for less money in the measurements. The only thing that came out ahead in the rankings was the benchmark amp(i forget the model#) with better distortion numbers but far less power for way more money.

If I don’t like it I can return it within 30 days so it seems like a good risk. I just got it hooked up for a test spin and it is indeed very clear and punchy. I still need to get my sub hooked up but what I’ve heard is promising. Also, it has a very quality feel to it which I’ve read wasn’t always the case with vtv in the beginning. It feels like a large boutique headphone amp, using the whole case as a thick heatsink. No extra holes in the bottom and looks good on my shelf with my other gear. Now for more music.

@soix thanks I’ll report back after spending more time with it. The mods look interesting but I think I’ll keep my warranty for now. Will look deeper into it for the future though. So far really enjoying the new amp . I didn’t know my speakers had this much left to give. It sounds so freaking clear and powerful. I was watching the clock at work today wanting to come home and listen to different kinds of music and see how it does. Good times!

Been listening for awhile and seeing how it goes with different music.  I still haven't really noticed any unpleasant high frequencies but I will say that the vtv eval-1 is unforgiving.  On one hand there are albums that are perfectly recorded that I can crank up and everything sounds flawless with tons of detail and liquid smoothness. 

On the other hand there are some albums I've had forever that I didn't realize aren't that well done. The downward spiral, sergeant peppers lonely hearts club band, and swing the heartache are albums that sound better the louder you go because there are more layers you louder you go and none of them are harsh. Sadly some of my Led zeppelin and pink floyd sound a bit low fi in comparison even though the music is still good. 

Every time I start to have doubts I run into a different recording that was done properly and sounds incredibly good.  This setup does nothing to hide flaws but it flies high when it has something to work with.  Hope that made sense.