Emma Kirby & Chris Hogwood with Academy of Ancient Muisc is very good - they play everything on period instruments or replicas - so it sounds closer to the orginal, as it was intended.
If you are a student of the work, then you'll find the recent Nikolaus Harnoncourt/Concertus Musicus Wein version intriguing. The recording itself is amazing!
Plenty to chose from. I like Peter Schreier on Philips and Hickox on Virgin Classics (an appropriately terrifying version).
For an interesting comparison, look up Michael Haydn's (Franz Joseph's younger brother) Missa Pro Defuncto Archiopiscopo Sigismundo. This work was composed 20 years before Mozart's Requiem.
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