Well, I'll assume this is in addition to your arsenal listed in your signature & that you are getting 3 balls from other company's as well & could fill gaps? Also, not sure of your reasonings so I'll assume them w/out knowing. So I'll say that looks good. I personally would pick the T-Road Solid, Attitude or a Roto Cell over the T-Struck solid, but that's just me. Maybe you're looking at a solid to be under your Special Agent that's why you chose T-Struck? Also the new Street Rods will be out around the end of this month. W/out seeing them yet not sure how'd they be compared to your Neptune. The pearl one might be close & the solid is probably weeker than the T-Road solid & your Special Agent.
I have the Gravity & love it. Been wanting an Agent for a while, but I love the Shift line. Also been waiting for the Agent to go on a special deal, but it's been holding it's price since it was released it seems like.
These are just my opinions, good luck.
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"The last time I saw a face like that, it had a hook in it's mouth."
Rodney Dangerfield