If you 'like' Evangelion, then you will definitely like RahXephon.

RahXephon has been compared to and written off by Eva fanboys as an 'Eva Clone', but it definitely isn't. I'd even say it's better. It has similarities, but the overall concept is well thought out, well executed, and very very enjoyable.

Eureka 7 isn't as good as RahXephon, though it comes pretty close. (It's made by the same people.) Like RahXephon, it's not all about the 'mechs, but the characters. The characters are the best part of these shows.