My wife and I just made our first payment on a trip to Southern Italy for our 20th wedding anniversary! ( Novemner 1-8) My friend Kevin Mckrell was offering a 8 day tour called " Southern Italian Odyssey" which features Naples, Amalfi Coast, Pompeii, Sorrento, Gaeta and Montecassino. My brother and sister inlaw will be joining us, which makes it even more special. I hope to be able to find a board like this for Italy, but I am pretty sure none exists! I will still lurk here to get my Ireland fix, but may be busy learning basic Italian.
Congratulations on your 20th! It sounds like a wonderful trip. You can also try Fodors and Trip Advisor forums for Italy. Before you know it you will have plenty of advice for your anniversary trip.