Sharks

So I'm thinking about buying a 250 gallon tank, and I'd like to see if I could get any sharks. I don't like the little skinny ones like the black banded cat shark or the young brown banded shark. So is there any cute that sells for a reasonable price. I can't get a black tip because the tank is on 15 feet long but any thing like a adult brown banded shark would be good. If the black banded cat shark gets to lose the stripes and get bigger than I may want to just raise one myself.