Which of these bowling balls are better?

I want to purchase my own ball and shoes because I want to learn the hook and I am going to join my high school team. Here are the balls:
Storm Tropical Storm
Power Groove
Roto Grip Sword Nomad
Roto Grip Mars and Pluto
Which of these best suits a beginner? I have been working on my form. I do not have a coach. Are there any other ball you recommend for a beginner?

One advantage of the Roto-Grip balls is that they have asymmetric cores which give the balls a lot more power than their Brunswick or Storm counterparts. Keep in mind that they cost a bit more, though.

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