DKF, yes more CDs are certainly better than less, so since you said "all" the Strauss waltzes(he composed over 400)you might still need a few more of the 50 or so CDs which they'll fill! I admit that I have less than 10, including 5 of Boskovsky's.

For Prokofiev's R&J my favorite is the complete version by Maazel with the Cleveland. If you don't also have his Cinderella you might consider this bargain by Ashkenazy, which also includes an excellent Glazunov Seasons.



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Enjoy the music, not the equipment.