My immediate response includes these 3
Don Carlo - conducted by Carlo Maria Giulini and starring Domingo, Caballe, Milnes et al. Still available on EMI
http://www.amazon.co.uk/Verdi-Don-Ca...5459672&sr=8-1
Un Ballo in Maschera - conducted by Votto and starring Callas, Di Stefano and Gobbi - one of the legendary 1950s Walter Legge recordings for EMI
http://www.amazon.co.uk/Verdi-Un-bal...5459788&sr=1-2
Otello - conducted by James Levine and starring Domingo, Scotto and Milnes. The earlier Domingo recording which I prefer but some do prefer the later Domingo recording.
http://www.amazon.co.uk/Verdi-Otello...5459898&sr=1-2