I started out with the HE400S, and when I compared them to the Sundara there was very little difference between the two. Then I moved up to the Arya Stealth and that was at another level as you’d expect given the significantly higher price point. I’d have to think the Ananda Stealth would capture a good bit of the Arya Stealth’s performance, and if that’s the case then no doubt go for the Ananda Stealth over the Sundara. The Ananda Nano isn’t much more expensive so may be worth looking into them as well, and I can’t speak to the Edition XS. BTW, I bought all my Hifiman ‘phones refurbished from them and they were both perfect/like new, so if that helps you to get a better model I’d highly recommend it. Hope this helps.