OK - in answer to Nate's original question I will deal with the '50s first (Marsh as leader [or shadow leader in one case and sideman in another]).
The Jazz of Two Cities date is essential. The Capitol reissue includes their Tristano sides as well. The sound and notes are terrific.
Little attention has been to the Mode date. This is a very well recorded quartet date from just after the demise of the band with Ted Brown. The rhythm section is Ronnie Ball, Red Mitchell and Stan Levey. Get it.
Supplemental to these are the two dates this band made under other "leaders". The first is Free Wheeling made for Vanguard, under Ted Brown's name. The second is the date under Art Pepper's name for Contemporary. The Vanguard date is currently available in a two disc package from Fresh Sounds, coupled with most of "Two Cities" and some other goodies. The most complete version of the Pepper Contemporary stuff was issued on a 55 minute disc called Art Pepper with Warne Marsh (more complete than the initial domestic release.
The Atlantic date (in the Mosaic box) is superficially uninviting. The spare, dry sound takes some getting used to but it is a fascinating document.
I have ignored "private" recordings per the initial request, but must mention the Xanadu lp for those wanting to dig deeper. This is a recording was made by Bob Andrews in 1952. Warne is playing in a club with Hamp Hawes, Joe Mondragon and Shelly Manne. After the glimpses of a "talented player" from the Tristano and Konitz sides, this shows the musician in full flight. I find these recordings irresistable.
I hope this helps someone discover the genius of Warne.
More to come later.