RyeGuy - If you want aggression, go buy a bear. you wont be able to provide for that either, so not a massive jump eh?
In all seriousness, why the obcession with over aggressive fish? I honestly think you'll be hard pushed to find a fish that you can house thats as angry as you want.
I get the feeling fish keeping really isn't the hobby for you. Not being harsh, but you dont seem to have the patience, the resources or the maturity (judging by your posts, your in your early teens?) to care for you stock (Every one of your tanks is too small for the stocked fish)