From what it sounds, at least 2 balls are in order. Potentially 3. All of the manufacturers put out good equipment these days.
If you go Storm/Roto Grip, you could check out the Outlaw (medium-heavy), Marvel (medium-heavy), Rising Star (medium-light), Tropical Heat pearl (medium-light).
If you go within the Ebonite family of companies, you could always go with the Game Breaker (medium-heavy), Track 503C (medium), Track 300T (medium-light), Ebonite Cyclone (light-medium), Hammer Arson (medium-heavy), Hammer Vibe (medium-light.)
However, before you consider ANY ball, I strongly recommend that you visit a good pro shop and discuss your game with them. Better shops will make you go out on the lanes and throw what you have to see what your game is. That is extremely important as it increases the chance that your equipment will actually work the way it is supposed to for you. You will also get suggestions specific for what you need.
Even though we have given you some general suggestions, we in the forum cannot give you concrete choices for what will work on your game since we cannot see how you are bowling (unless you put it up on YouTube or something similar.)
Note: The best advice is to repeat what I said earlier. It's important to find a good pro shop with a driller that will take you on the lanes. The better shops will do this. If the shop you go to does not do this, you could possibly end up with equipment that will not work for what you specifically need.
Also, keep in mind that if you have stuff drilled wrong and need it redrilled, you'll be spending a quick $40-60 or more, depending on what's needed to plug/redrill the ball. That's why it's so important to take the time and do it right.
My arsenal
Heavy Oil: Storm Virtual Gravity Nano: 2000 AB
Medium-Heavy Oil: Storm Anarchy: 1500 polished
Medium-Heavy Oil: Ebonite Vital Energy: 4000 AB
Medium Oil: Roto Grip Nomad Dagger: 1500 polished
Medium-Light Oil: Roto Grip Rising Star: 1500 polished
Edited by tommyboy74 on 12/3/2011 at 1:37 AM