The Castle Copperhead 10 you mentioned may be too much for the trucks you have, except for the Revo and T-Maxx possibly. For the others, the Mamba X SCT 3200KV, a Reedy 3300KV or 3500KV combo, or a HobbyWing ESC and 3500KV to 4000KV would be a better choice. Even the Traxxas VXL-3S system, which has a 3500KV motor, would be better in any of those trucks. I'm currently running the VXL-3S in a Slash 4X4, and that truck is wicked fast, even using nimh batteries. Its more about how its geared, than how big or small the motor is. Motor size does play a part, because with the wrong motor, it wont have enough speed or may run too hot, but, in a lot of trial and error, i have found that 3500KV to 4300KV is the sweet spot for 1/10TH off road trucks on 2S and 3S. Of the brushless trucks i currently have, I'm running a Reedy 3300KV combo in my Associated ProSC10, the VXL-3S in the Slash 4X4, and i was running a Castle Mamaba X SCT 3200KV combo in the HPI Jumpshot, but, i went back to the original brushed setup, because the Castle made it nearly uncontrollable. Monster trucks shouldnt have brushless motors, unless you like being upside down a lot. As for the Ruckus and Torment, i personally wouldnt run anything bigger than a 3500KV, and not a very large pinion, unless they have the metal gears in the transmission. I had both of those trucks, and ran them with 4300KV cheap GoolRC motors, and the plastic diffs didnt last one battery. As for a radio, i would add a Fly Sky FS-GT3B to your christmas/birthday list. They are pretty good radios, waterproof receivers are really cheap, compared to other brands, and you can run up to 10 trucks on it (not at the same time though).