I meant that as in what can you keep/not keep legally in your state (mainly applies to piranhas and snakeheads).Not a whole lot, My only LFS is Petco and they really only carry undesirables ... I'd probably do majority of my fish buying online.
If you want a community predatory tank, there are a few options open to you that would probably work anywhere within the USA.
Predatory African cichlid tank (the larger haps such as eyebiters, Malawi gar, Christyi, etc) where you can have 8-12 large predatory male haps that will be both colorful and capable of existing as a community as, even though they are predatory, they aren't necessarily super aggressive towards each other and, because they are Africans, you can always crowd them to minimize any issues.
You can keep something like an Oscar in there along with some bichirs that will eat the feeders you throw in.
You can try to go native and get a bunch of small/medium sized NA preds like a grass pickerel.
You can get a small group of needle-nose gar and keep them with other fish that they can't eat.
Up to what you're looking for besides that fish eating.