Definitely get something for the slicker conditions. Marvel has a more controllable (smooth arc), NANO has more of a strong motion (slightly snappy) off the spot. Both have there place in any bag.
Think medium and either a Reign Supreme comes into play or a Victory Road. Both would compliment and RS has some more versatility if you put abralon on it when needed.
If you want a benchmark ball to read with, Victory Road Solid is a good place to go. Lay it out pretty standard so you can read the condition and make tweaks from there. If your willing to go into the Roto line-up, an Outlaw might be even better here since the diff on the block makes it slightly less flaring.
Dryer or less oil would be a great place for a Trop Heat Hybrid or Rising Star. Use you abralon to slow either down as they are both slightly stronger than advertised.
A good spare/bone dry combo ball might be a Tropical Breeze pearl. I drilled the pink one and it has a nice motion for a very low powered ball. Don't get me wrong, it will go pretty direct. But this should be the equivalent of the Power Groove Dry if anyone remembers that ball.
I wouldn't be afraid to look at Roto Grips line also to plug in gaps. A lot of bowlers get into this mindset that Roto is "more of the same" from Storm and it is not. I didn't see a motion like the solid Nomad in Storm's line for awhile.
"Tell me Cup, how does a great ball striker like you shoot an 82? Well I lipped out this putt on 18......"
Mike Craig - Storm Products Pro-Shop staff -Columbus, OH
