Your gonna love the lunch box. I had an original yellow one when I was in my early teens. Not too sure what happened to it, but I had to have the blue edition lunchbox when they came out. As for mine I left it all stock except for the bearings, and oil filled dampers, and aluminum body mounts. It has the new TBLE-02s esc Tamiya now includes with all re-releases. Its actually a really smooth controller, but it does lack lipo cutoff, so I run a 2000Mah NiMh pack. The ESC's cutoff it does have is for LiFe cells and is too low for Lipo's. Beware in putting too much power in the truck, it loves to wheelie even on a silver can motor. Honestly a 13.5 would probably be the max I'd go with, a 17.5 probably the ideal power plant, or the 15.5 you mentioned. I switched to the oil filled dampers because the stock springs are way too bouncy for my taste, but again that's alot of the appeal to this style of truck. Its all about the wheelies with this truck for sure.