Those V2 TrackStar motors that a couple are recommending are surprisingly good. I originally bought some Turnigy TrackStar systems to use as "budget" setups but over time, a few have ended up in some of my tier one racecars, replacing much more expensive systems. For all out smoothness, which is likely highly subjective, I'd have to agree with mojotom and mikeyscott. I've got a few ORCA VX3 Esc's running ORCA VS3 motors and they are noticeably smoother regarding the powerband out of the box. A close runner up would be the Team Orion R10.1 running Orion VST2 motors. Unfortunately both of these systems are at the top of the price range. Are they $200 smoother than the TrackStar V2's? I personally don't think so. YMMV.