Such a tough question. I want a tank with a RTGXB arowana and some nice black rays, mostly 1000 island BDs someday. I would probably stay disciplined and keep it at that, but adding a big ST dat and/or a lince catfish would be tough to not do. Same for a platinum gator gar, or piraiba. AUL too, and boesemani and snow leopards, and probably pearls too. See, this kind of rambling gets me off topic - just the aro and black rays.
It's pretty tough to choose between a top grade aro and a top grade black ray. In thinking though, if I could only have one tank - it would be for these:
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Uaru are tough to beat. Such an interesting fish, and IMO the best looking cichlid available. So if I gotta choose just one... it's the uaru. But I can't do without the black rays and aros
Could do without all the other fish on that list, but sure wouldn't hurt to have them.