First off, I personally consider Iced Earth more of a thrash band than power metal. Just because some of the songs have high vocals doesn't make them power metal. But, that's just my opinion. Regarding their best albums, I can sum it up in 2 words; Matt Barlow. Not only is the guy one of the best singers ever, but the albums he's on are the best musically too. My personal favorites are Burnt Offerings, Something Wicked This Way Comes, and The Dark Saga. Horror Show is great too and their newest album with singer Stu Block is pretty good. In my book, Ripper Owens doesn't compare to Barlow or Block, so personally I would avoid those albums.