Dear BobbyBubby,
The correct answer is, of course, ALL OF THEM!!!!!! You need her two Carnegie Hall albums": "Live at Carnegie Hall" and "It's Better With a Band" (If only for "One Hand, One Heart", you will want to get married to it.)
You need "She Loves Me" and "The Grass Harp" (If only for "Chain of Love")
You need her album of Rodgers and Hart songs, and you should treat yourself and get the DVD of her appearances on the "Bell Telephone Hour".
"A coherent existance after so many years of muddle" - Desiree' Armfelt, A Little Night Music
"Life keeps happening everyday, Say Yes" - 70, Girls, 70
"Life is what you do while you're waiting to die" - Zorba