Whatever you choose, make sure it's something you want, rather than merely something that is trendy and popular among the In crowd. Who gives a crap what other people think? You are looking at and hopefully enjoying that tank on a daily basis, so make the most of it.
I'm not really a cichlid guy, but I'd find it almost impossible not to include some Oscars in a tank like that if my water were appropriate for them. Parrot Cichlids have always appealed to me as well, but I've never even seen a live one let alone owned them. And I was only partially joking about goldfish...for a low-stress, peaceful and attractive tank they are terrific.
Whatever direction you go, I really hope you are planning upon keeping in mind the water chemistry of your source. If you have a tank housing fish that require RO, de-mineralization, re-mineralization, pH tinkering or all of the above...and its normal water change involves hundreds of gallons...the required preparation of that much water on a regular basis will get real old, real fast. Don't forget that this hobby is supposed to be fun.
Whatever kind of water you have coming out of your tap...I guarantee there are beautiful, interesting and attractive fish that will thrive in it just the way it is. Deciding you simply must keep fish that are poorly suited to your water and require varying degrees of mumbo-jumbo will take the sheen off those species sooner rather than later.
I'm anxious to see which way you go.
