The Dynamite alum stuff is fine. It's a Mini T after all.
Venom Fireball is that other motor you were thinking of. Pretty low end I think.
I have only charged-discharged the Rocket packs about 8-10 since I've had them. So far so good. I only charge them for about an hour to keep them cool.
Now I'm shopping for tires...who has a good source? Street treads and foams is what I need. Unmounted or mounted.