 If you liked
Mahou Shoujo Lyrical Nanoha StrikerS
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 ...then you might like
Senki Zesshou Symphogear AXZ
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If you like Nanoha there is a very good chance you would like Symphogear, as well. Both of these shows take inspiration from the Mecha and Magical Girl genres with heavy focus on action and characters. Both also have Nana Mizuki star in a main role ( Fate in Nanoha and Tsubasa in Symphogear) and sing the opening themes. Of course, as tradition for this type of anime, they are both very gay.