My personal favorite is Elfen Lied. It has great art, stunning music that you'll be hearing all day, and it gives me goosebumps after finishing the series (Which made me feel like someone cut out part of my soul)
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Edited by Lord Commissar: 7/22/2013 11:41:51 PMAlthough Ginyoku no Fam was ultimately disappointing when compared to its predecessor, the imagery from the point of the glissando at 0:58 and everything after is particularly memorable to me for some reason. I don't really have a favorite, just ones I like more than others and this is one of them.