SyndicateI have an Aune T1, Bravo V2 (V3 minus the EQ), and DT990 Pros. They sound nice with either amp, but personally I use the Aune T1 as a DAC and the Bravo as an amp. I have switched between them with the DT990 Pros though and it's not easy to tell the difference. You'd likely be happy with either choice.
SyndicateI'd get the Bravo too if I were you.
DT990 may be too bright for your taste with that combo.
As I've mentioned earlier, I believe the O2 to be a great sounding amp.
But IMO it doesn't play well with bright headphones and might sound too analytic or harsh.