My advice is, don’t buy anything before you hear it. Your current setup is good enough that it’s too much of a risk to buy before hearing.
The latest bargain darling is the Topping D90. I would be tempted by that if I needed a DAC. Its measurements show evidence of excellent engineering, and most comments I've seen about its sound quality have been quite positive. If bought from Apos Audio, it can be returned if you don’t like it.
Good luck, and have fun!