There's no such thing as too many Requiem's

My choir started working on Britten's War Requiem on Monday. It is quite something. Since I've had bits of the Dies Irae going through my head, but don't yet have a recording, I was looking through my collection of Requiem recordings. I have five: Mozart, Faure, Durufle, Brahms and Weill. I've performed all of those but the Weill, which is for men's chorus only, and done the Mozart and the Faure twice each. I've also performed Rutter's Requiem (oh, Rutter—as my voice teacher used to call him, "Episcopop"), but I don't appear to have a recording.

Which leads me to the gaping hole in my collection of Requiems: Verdi. I've never even heard the Verdi Requiem, a piece which most of my fellow choir members have sung multiple times. So it's high time I get a recording. So I'm throwing this out there in the hopes that somebody on the vast internets is a classical music snob: what's the definitive recording of Verdi's Requiem? I see both a Leonard Bernstein and a Robert Shaw, both of whom are generally reliable, but I'm wondering if there is one recording that everyone agrees is the best. Thoughts?