I'm thinking very aggressive! !!Depends on what sort of Cichlids you want. You first must decide between 4 Categories: Peaceful, Moderate, Aggressive, Very Aggressive.
Once you have decided on this, we can help assist your further. You have A LOT of options in a 250 regardless of which path you choose, but to go by what you said "don't have to worry about them killing each other later on." I would look at and research some of the following: Uaru's, Discus, Firemouths, Acaras, Angelfish, Oscars... etc.
Thanks I appreciate all the infoIf I were you, I would pick and choose what you want to work out. Any combo can work if you give it time. 250 isn't too bad of a size for a lot of cichlids. You can get away with a lot, I mean you won't be able to toss in an Umbee or Dovii with one of them taking out all your fish, unless your tank is HUGE, but if you stick to fish between 5-15", you won't have much of a problem. You may have to trade in a few fish, such as if you got an Oscar that didn't like any other fish, simply trade it in for another Oscar hoping it will work and it usually does. Besides the Umbee and Dovii, I haven't had a combo that didn't work yet. If my tanks were big enough, over 1000 gallons then I'd try an Umbee in with my other fish but I would still be worried. I think there is a member on here with a big Umbee in a community tank, someone told me about but haven't seen it yet.
You also need to watch out for cichlids with huge mouths such as Jags. I have a Jag that tried to eat a 5-6" Salvini, he didn't eat it but got stuck in his mouth and I had to do surgery, the Sal didn't make it but the Jag is still in my tank. So with that said, I moved my fish around that he was able to swallow or at least get inside his mouth. There are other fish such as Oscar's, etc. that get big but have a small mouth. So you could mix smaller fish in with them.
Anyways, do a little research in what you want, how big they get in aquariums, etc. You will make it work eventually.
Yea i like high aggressive cichlids I just recently got rid of my dovii at tropical fish bowl. I have Africans in the 250 now but most of them died since I been offshore so I was just thinking about going back to ca/saParatheraps -- Get em at 4-6 inches, or smaller if you don't mind waiting, get 4 of each species, overstock it just a little bit while the fish are young, and try to select for fish that aren't overly psychotic. Breidohri, Bifa, Syn's, Argentea, Zonatus, Fenestratus, etc.
Or, you could go with Jags, Trimacs, Hoga/Barred Midas/Amarillo type. I think a tank with those fish would qualify as "very aggressive". In fact, if you went this route, and had some fish that didn't quite work out in your tank, I'd take a look at 'em and take em off your hands if they look good. I live right by you, and I'm gonna have plenty of tank space pretty soon.
In fact, I have a surplus of Argentea now, about 3-4 inches long, I'll be looking to get rid of 2 or 3 of them in a month or so. I've had them for 7 months now, they grow real slow.