I agree with Charlest, as you should have someone observe your style before buying a performance ball. What is the name of the ball you have now? It isn't performance right, urethane, maybe? Is it drilled conventionally or fingertip? A performance ball should always be drilled fingertip, so if you're throwing a conventional grip, the change will feel different (but you will be able to hook it). Do you have a coach or do you take lessons so that someone could make a suggestion? Are you going to be attending a summer camp? People there can help you with this kind of thing. It also helps to know your revs, speed, and axis tilt.
For typical league play, and for someone who is buying their first reactive ball. I would suggest a Brunswick ball. Some good ones for you would be a Red Zone, Rampage, Punisher, or Power Groove. If you have low revs and/or high speed would ask for something a little stronger, such as the Wizard. However, as Charlest pointed out, that ball will react more than the others mentioned. If I had to vote Brunswick for you, I would vote for the Rampage, but once again, I do not know the critical information required to select your next ball.
As for Hammer, I would suggest the Doom, but I wouldn't start an exclusive arsenal with Hammer.
There are many other companies out there you may want to look into. To name a few names, Storm (Jolt), Track (Heat Blast), and Ebonite (Black Ice). Ask an expert on this kind of thing, or tell us your revs and speed, and shoot a video this way, and we will make our best educated guess.
Good luck, Barbarian!
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I'll give you five bucks off 'cause you look like a guy who knows his BALLS!