Oh yes, wait. You don't want the hassle of ANOTHER tank that big being drained and fish being carried around. Gives you some time to thing about what you want better! :)
What's the height? You could do angelfish if it's tall enough. It's too small for oscars though. Goldfish would work, I know you like them. If you want better cichlid advice and ideas than I can give (I know like nothing about them), you can PM our user Tazman about it. He knows like, everything about cichlids of all kinds. There's a lot of aggressive cichlids that are smaller than oscars (but still big), like Jack Dempsey, so don't kick em out of the picture just yet.