Question first... how good are you at spare shooting? It's not always a ball that will take you to the next level, most of the time it is just tweaks to your current game that allow you to move up (ie. spare shooting, ball layout and surface, speed/tilt)
If you still think moving to Storm products is your best answer, then how many balls would you be looking at carrying?
Going off of your current 4 ball arsenal
I would go
heavy: Marvel-S
med-heavy: Byte, IQ Tour Pearl, Roto-Grip's Defiant Soul, Totally Defiant
med-light: IQ Tour Pearl, Wrecker
light: Lights Out, Roto's Shatter, or if you want weaker go Super Natural
If you're trying to save a little money, i'd even suggest not getting the new Byte and going with 2 IQ Tour Pearls with different layouts and surface to cover your mediums. If that is still on the expensive side you could go with like a Reign of Power for med-heavy and Hyroad Pearl for med-light