Need help choosing a DSD DAC


I'm just starting out in computer digital music. I've found the computer I will use, but I know nothing about a DSD DAC at the $500 range. I know it needs to be asynchronous (whatever that is).
Sorry for my ignorance in this field.
Thank you in advance.
zmanastronomy
Look at the Ami d5 that's for sale on here (no affiliation) six moons gave it a positive review comparing it very favorably to a much more expensive DAC. You might also look at offerings from ifi.
TEAC UD-501 has garnered some very good reviews....supports 2.8 as well as 5.6 DXD.