Jgreenwood, good catch to point out that we've not covered many entry points using Baroque music (Bach's Mass in B can be a challengin entry point). I like your Bach and handel suggestions above. To those, I'd offer:
Telemann's Tafelmusik (Music for Table). The Reference Recordings disc with the Tafelmusik Baroque Orchestra is not bad, but I'd recommend Bruggen/ConAmsterdam on Telefunken as a better entre.
Albinoni, Adagio in g (Marriner/ASMF, Brown -vn, EMI)
Allegri, Miserere (Tallis Scholars or Willcocks and the Choir at King's College on Argo)
Buxtehude, Sonatas for Violin and Cello (Boston Museum Trio on Harmonia Mundi)
Gabrielli, just about anything, particularly his music for brass
Monteverdi, Selva morale e spirituale (Christie/Les Arts Florissants on Harmonia Mundi)
Collections:
"Laudate!" or "LaudateII" (Drottingholm Baroque Ensemble, Uppsala Academia Kammarkor, Proprius)
"Recital" and "In Concert" and "A Second Recital" by the Academy of St. Martins in the Field, with Marriner on Argo.
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