So it appears I will have some extra money within the next few months. I currently have the Beyerdynamic DT 990 600 Ohms, which I really like. I was considering getting the Sennheiser HD 650s to complement them, but I haven't heard them and don't know how they will relate. I have the Asgard 2 as an amp, which I like, and the TEAC UD-H01 which I would've liked to have held off on to get the more costly Biforst Uber, but it's too late for that now.
If you guys wouldn't mind looking up the DAC and telling me where you think the ~$400 would be best spent, I would appreciate it. If you recommend a pair of headphones, please make sure it is open with good bass presence. I am young so I listen to a lot of hip-hop as well as acoustic recordings, and the DT 990s have been great all around. I am just concerned the DT 990s won't last because of the non-replaceable cable, so a use-replaceable cable would also be nice.
I am also considering another DAC instead of headphones but find it hard to justify because the amp made a difference but not a huge one and I just don't see a slight upgrade to the DAC doing anything better.
Thanks for any recommendations.