You can't go wrong with most of the box sets from Mosaic Records.
Mosaic Records Web Site
If high fidelity sound is a priority, stick with the artists who recorded in the tape era (after 1950, best by the late '50s).
The Mosaic Select series of sets is more affordable and offers the same high quality sound as the larger sets:
Mosaic Select Web Page
I have no affiliation with Mosaic Records. I am just an avid jazz fan who has collected nearly the entire Mosaic catalog over the years.
Mosaic Records Web Site
If high fidelity sound is a priority, stick with the artists who recorded in the tape era (after 1950, best by the late '50s).
The Mosaic Select series of sets is more affordable and offers the same high quality sound as the larger sets:
Mosaic Select Web Page
I have no affiliation with Mosaic Records. I am just an avid jazz fan who has collected nearly the entire Mosaic catalog over the years.