I love the Futaba S9551, but one Futaba that often gets overlooked is the S9452. It's not low profile, but not standard sized either. More like medium profile. Just as quick as the S9551, just as smooth and quiet plus a bit more torque. And it's less expensive, too.
On Road: ABC, Tamiya & XRay
Off Road: Losi, Mugen, RC4wd & XRay