If your question is based on sound quality, just about any of them. Hard to go wrong. The HDCD versions might be best if you have a unit which can decode them. If you are talking about performance quality, which performances are you interested in?
The Bruckner 9 is an outstanding performance as well as recording. One of my Favorite RR's. His Copland 3 w/ Applachian Spring and Fanfare for the Common man is a good recording and performance as well. Assuming you just want some generic classical recordings with excellent sound the compulation recordings with Eiji Oue and the Minnesota Orchestra (there are 5 of them I think) are excellent as well.
I have much of the RR catalog. If you have a specific Composer or recording in mind. Ask. Kind of tough to respond otherwise.
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