well i don't like traxxas so my answer is buy an Arrma
but sense you already have a hopped up stampede 4x4, what i would do is take the truck apart. give it a thorough cleaning and inspection. replace what's worn out with a hop up. throw in a new radio and a cheap brushless motor and new esc and let it eat. you'll have something better than a new truck for less money than a new truck.