[ComodoHacker]

Yet another similar game I can recommend is Stasrsector[0]. It's still in alpha, but is playable, enjoyable and moddable.

[0]. http://fractalsoftworks.com/

[Aeolun]

I can very much recommend this. Keep starting it up every few months and having days of fun with it again. Combat is really polished! Actually, the entire game is.