I'll start with this:

http://www.amazon.com/Rossini-Barber-Seville-Roberta-Leinsdorf/dp/B000003G4F

Roberta Peters. Absolutely an incomparable Rosina (if you allow the "soprano Rosina" variant. The role was actually written for a mezzo, but I'm reasonably confident Rossini wouldn't blink an eye at transposing for the needs of a given singer.)