@ Geekfreak,
I have every single Black Sabbath record, but yeah Ozzy era is my favorite era, love all the Dio/Sabbath albums, that goes for the Heaven And Hell-The Devil You Know album, which to me it's Black Sabbath Mark III line-up, Born Again with Gillan is also very Good, the Hughes and Martin albums take a little getting used to, but there is a lot of good stuff on those albums as well.
13 is absolutely frigging EXCELLENT, AWESOME!!!!!