Some of my all time favorites are the Spinward Fringe series by Randolph Lalonde, The Intrepid Saga from the Aeon 14 universe, and the Imperial Radch Trilogy from Ann Leckie.
A Memory Called Empire was really good, but it wasn't a space battle shoot-em-up, more like large scale political intrigue and murder mystery.
@Izzy brought up Tchaikovsky's Final Achitecture and @ScrumblesPAbernathy mentioned Children of Time series, loved those. Right now I'm on the second of his Bioforms books, Bear Head. After that it's back to Idris and The Lords of Uncreation.
While it probably doesn't qualify as space opera, I have to throw in The Murderbot Diaries by Martha Wells. I just fucking love Murderbot and ART.
There's always the Bobiverse, The Culture Series, and The Cluster Saga, too.