Agree with Kr4 on the Linn for SACD; I was not that impressed with the Channel Classics release with the Netherlands Bach Ensemble on SACD. The best performance in my book and a pretty good recording is the Peter Schreier (can't remember the chorus, it was a German chorus) performance on Philips, probably a recording from the 80s or early 90s--great soloists and singing. Check the archives for the Mozart Requiem, you'll find a number of recommendations as well as the details on the Schreier, as it made a lot of people's lists.
Telarc cd's and Mozart's Requiem
Back in the 80's got some Telarc cd's because they were supposed to be some of the better recordings out there. In general, do cd's sound better nowadays due to recording technology, etc. compared to the 80's telarc cd's or do the telarc cd's still hold their own? Also, can anyone recommend a quality recording of Mozart's Requiem (cd or sacd)? I currently have the 1986 telarc version by Shaw.