 If you liked
Ore no Imouto ga Konnani Kawaii Wake ga Nai
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 ...then you might like
Hyouka
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If you take a look at the premise and synopsis of both shown, they are nothing alike. However, if you start watching them, you'll find that the protagonists of both shows are, at heart, the same: Kirino and Houtarou are willing to open their true selves up, after getting a little push from someone close to them, or someone being curious.
If you liked the steady development in characters, or just seeing two completely different personalities interacting with each other and learning about themselves, you'll probably enjoy Hyouka and OreImo.