Your Favorite Classical Box Sets

I've been enjoying the Mercury living Presence boxes along with the Decca Mono box (I'm looking forward to the DG mono box). Which ones you like and which ones should I avoid.
Leonard Bernstein/NYP, The Complete Mahler Symphonies.
Excellent remastering.

Furtwängler Conducts Bruckner, Symphonies 4 - 9.
Music & Arts, Remastered 2008
Fritz Reiner RCA Red Seal Chicago Symphony Orchestra box set.

The complete RCA album collection.

63 CDs plus booklet.

If you like RCA living Stereo Lps.
I have the latest Mercury box set and have been eying the Lyrita Box sets lasiviously.
Looking at my shelf here for the big boxes. Those around on Amazon that I really enjoy (no particular order):

Philips Original Jackets Collection
L'Oiseu Lyre, "The Baroque Era"
Brahms Complete Edition
Scriabin Complete Works
Henri Dutillieux Edition
Rachmaninov The Complete Works
Ivo Pogorelich Complete Recordings
Tafelmusik Baroque Orchestra Complete Sony Recordings
John Eliott Gardiner Complete Bach Cantatas
Shostakovich Complete String Quartets (Mendelring) -- SACDs
John Cage Complete Piano Music
Bach Complete Organ Works (Simon Preston)
Iannis Xenakis: Alpha and Omega
Gyorgi Ligeti: Works
Gyorgi Ligeti: The Ligeti Project
Living Stereo 60 CD Collection
Beethoven Complete String Quartets (Tokyo) -- SACDs

That should keep you busy and out of trouble for a while. Happy to discuss any one of them.
Bartok, The String Quartets, Juilliard Quartet, Columbia1960's stereo
Beethoven, Complete Quartets (three sets--early, middle, late) Guarneri Quartet RCA
I have several versions of Beethoven's Fifth Symphony, my favorite of all of them, #3, #7 and #9 are near the top of my list.  If I had to chose "the best" I'd chose Herbert Von Karajan's 1963 recordings with the Berlin Philharmonic (remastered).  I may change my mind on that, after the George Szell/Cleveland Orchestra set arrives though.