On the last number of vela :
Giornale Della Vela | Scopri il numero di Vela di ottobre in edicola e su iPad Ecco com il nostro Salone con oltre 130 barche appena varate o che scenderanno in acqua nei p
They have an article regarding sailing on the south coast of Sicily. It confirms what I had said, lots of places to stay (in ports or marinas) but few places sheltered for anchoring...and the places are expensive. They talk about having paid 70 euros for a buoy (prices for boats over 10m).
Maybe you can command the magazine...or send me your email on a PM and I will scan the article for you (I arrived yesterday from Rome and bought the magazine to read on the airplane).
For me Sardinia/Corsica easily beats Sicily. It is not by accident that the French call Corsica "the beautiful Island". In Sardinia and Corsica some marinas are also expensive but you gave a lot more nice places to stay safely on anchor (I have cruising all around both Islands).