Out of your choices I would definitely pick The Chain, it's one of the only songs my friends can stand and they almost hate FM. To me, Rhiannon from Rosebud may frighten a newcomer, but given the circumstances, it may be a good option. Silver Springs is, as you said emotionally raw, and a masterpiece, my friends also like this one. Sisters Of The Moon may, like Rhiannon, give a different impression from the norm of FM's songs. However, if you were talking only Stevie, I would definitely go with SOTM