If you liked
Project A-Ko
|
...then you might like
Kill la Kill
|
Kill la Kill was very obviously inspired by Project A-ko Both have lots of over the top fight scenes, are about high school girls with very similar personalities (thankfully Mako is far less annoying than C-ko), and are mostly comedy.
If you liked
Senki Zesshou Symphogear
|
...then you might like
Macross Δ
|
Both of these are sci-fi action anime involving singing girls/idols fighting (although the singing girls themselves fight more in Symphogear).
If you liked
Tenkuu no Escaflowne
|
...then you might like
Kuromukuro
|
Escaflowne is about a school girl meeting a boy from another world (while in that other world) while Kuromukuro is slightly different as it's about a school girl meeting a samurai from the past who came to present day Japan. Both of these anime have mecha in them and although the settings are slightly different, I think if you liked one you'll probably like the other.