I have an old Rustler XL-5 that my son has become comfortable enough with that I'd like to upgrade the motor and REC to make it more interesting. I live in East Texas so it can get ridiculously hot. I'm not looking to set land speed records. A legitimate 40mph is sufficient. My primary concerns are ESC/MOTOR temps and run time. The only Lipo batteries I own are 4s so I'll be buying new ones anyway. I was looking at the Mamba X with a 1410 3800kv and some SMC 3s 6000mAh batteries. Is there anything out there that would better suit my needs? Anything that would do it at a lower price point?