I have a set of Audiotechnia Ath 700's headphones and a set of Ediffer S330D speakers.
The list of supported opa's are : OPA 2134, 2011, 2107, 2604 and 2227; LM 4562 and 49720; NE5532; JRC4558; LT1358; and finaly AD827
You might be better off selling off the Audio Technica ATH (?)700 headphones.
and putting all your "audio" budget for something like the ATH-A900X or AD900X headphones.
The DIP8 package is mostly obsolete these days, newer chips only sell as SOIC8.
OPA1641 is "unity gain stable" meaning that there's no chance it'd mess anything up for DAC filtering purposes, this is a far better sounding chip than any cheap DIP8 dual opamp you could find IMHO....of course there's always the NJM Muses opamps family but these cost 50 bucks a pop.