Where to start upgrade

Frenchie nailed it.Spend the majority of your budget on the best speakers you can afford.The Elite has plenty of power & pretty decent sound.
Once you have a great pair of speakers,a good Integrated Amp would be next...

Your most effective upgrade begins with your listening room. Disclaimer ... I'm a dealer. But I'm altruistic when it comes to our hobby. I won't push a product on you but only share my personal experience. The merry-go-round stopped when I fixed the room. I tried all the traditional treatments since the early 80's. One of the biggest head shakers was learning that some gorgeous absorption products that are found in studios and music rooms for many many years has a reflective fabric. So when testing the fully treated room we were still seeing significant bass nodes only to learn the lesson of the fabric used. It's from the same company that supplies nearly every acoustic treatment company out there ... it looks nice ... but the money was spent on a cosmetic solution and not acoustic.

If you're good to go with your room then i completely agree with the prior responses.

Enjoy the journey to a better room.

I have been "upgrading" since I was 14 years old....the MOST expensive path to audio perfection.