Everyone should have a set of the Brandenburg Concertos. Modern recording, but then again do you prefer modern or original instruments? There are two modern recorded original instrument recordings out currently. One by Trevor Pinnock and the other the Boston Baroque/Perlmann. If you like modern instruments then look for Neville Marriner and the Academy of St. Martin in the Fields.
For voices Bach's cantatas are a good bet. There are hundreds of these. Other than the above artist look for John Elliot Gardiner, Helmut Rilling, and Ton Koopman. There is also the B Minor Mass, St. John Passion, St. Matthew Passion. It you want an overdose of Bach, Helmut Rilling is recording all of Bach's works in a mega CD set, The Complete Works of Bach. It will be hundreds of CDs. (Can be purchased in partial sets.)