Hi Casey,
You definitely have a good start with the Nano and alpha-max, both are good balls which can be of use to you. When creating an arsenal, having different surfaces is as important as having a bunch of different bowling balls. At this time I'd make sure those two balls have different surfaces. Both are designed to hook early for heavy oil. If it were me, I'd probably have the Nano at 2000 with no polish and the alpha-max at 4000 with polish in order to cover some medium conditions. When you add other bowling balls to your arsenal, this can change.
A couple of bowling balls I would look at to round out your arsenal would be the Storm Marvel Pearl (length with a strong, controllable backend reaction), Roto Grip Outlaw (benchmark reaction in order to judge the lane condition and make adjustments) and something for med-dry like the Storm Frantic, Roto Rising Star or Storm Tropical Heat Hybrid.
Obviously, we've never seen you bowl so it's hard to really give you the best suggestions. If you could give us some more info (rev rate, speed, axis tilt and rotation) or post some video of you bowling, we could give you even better suggestions.
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