I've ploughed through many of the studio recordings of Aida (both Cetra recordings, both Tebaldi recordings, the Callas, the Milanov, the Nilsson and the classic Caballe/Muti) but this is the one that holds the top notch.
Leontyne Price's voice is young and sweet. Vickers was a strange choice, given who was knocking around, but he is undeniably an heroic Radames. Gorr is absolutely superb (why she was not dragged into the recording studio more I'll never know) and Merrill is warm and rich in tone, but Solti is the star. He draws a huge sound from the Rome Opera Orchestra, though I also have to give credit to Giuseppe Conca for the sound that the chorus produce - the bass priests' honeyed tones are beautiful.
Price and Merrill fighting it out in act III is one of my all-time favourite moments of recorded opera. Many people would, understandably, suggest the Caballe/Muti recording but please at least try this one first - I love it.