Don't know that I could say what the ideal or best would be. But, I can tell you that I have a Kyosho ZX-5 with a GTB/Velocity 5.5r brushless combo, Futaba 9451 Steering Servo, and the little Hellios 302 rx. Everything fits well, and runs excellent. It is fast from bottom to top, and the steering servo is plenty for it with a quick transit time. I am running SMC 3800 matched race packs and I am getting about 10 min runtime on a pack charging at 5amps with good power (Power doesn't seem to drop till the last 30-45 seconds but then it drops quick). I did put the aluminum front hinge pin brace, front&rear shock tower mounts, front knuckles and 7* c-hubs on it (I am not the most graceful driver), but now it is rock solid and handles really well.