 If you liked
Gantz
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 ...then you might like
Shoujo Kakumei Utena
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Both shows are similar in their psychological factor and could be characterized as weird. Although Gantz is a sci-fi series with a lot of violence,nudity and splatter it is quite similar in the fact that both shows use symbolism and require from its viewer to think and question what they see. You will need to think about what people's characters and their relationship to each other and their environment represent. If you liked the "weird" aspect of Gantz and you like in general mind f***ks than you will like Utena.