RE: Sidewinder vs. Mamba Micro Pro
i think you'll be plenty happy with the sidewinder. the pro will just have a little more power potential. And for bashing on a track, i think the 6800 would be good for you. like i same my mamba 25/8000kv run pretty fast on 6 cells. i've noticed with the dtx battery i'm running it has a little trouble supplying enough amps to really launch the truck at full power, so just make sure you get good batteries, you may even find you'll want a 2s lipo for it, they're not too expensive for the minis.