I don't know if this has been suggested before, but I am sure that it would come up in any discussion of Tape Project classical releases. The Planets (Gustav Holst, an Englishman if you didn't know) has long been an audiophile favorite, and there are lots of potentially interesting analog recordings out there - the Mehta on Decca has long been a darling of the audiophile community (Mehta is by a long shot not my favorite conductor. I own this on a 7.5 ips tape but can't recall ever playing it), the Stokowski on Capitol and any number of recordings conducted by Boult on EMI. Steinberg on DG would be a contender in my book as well.
Anyway.....The Planets would probably work great on tape, although it wouldn't be my first choice for a big orchestral piece (have I mentioned Mahler's 1st symphony before?). I bring it up mostly because I am going to hear it live for the first time Feb. 11 (at Flint Center in Cupertino) with the SF Symphony conducted by Dutoit (a great conductor, a shame that much of his work on record is disfigured by digital sound). In all of these years of concert going, I can't believe I have never heard this work live. It is coupled with the Walton violin concerto, a really interesting piece of programming.