I'd recommend a Castle 1410 (3800KV) motor and either a Castle Sidewinder or Mamba X ESC.

The 1410 is way more than needed for a 2WD car which makes it an excellent choice because you can gear it about the same as the Traxxas recommendations for the Velineon and it will run cooler. It will be plenty fast on 2S and you can run it occasionally on 3S if you are careful with gearing.

I have this combo in a 2WD Slash and a 2WD Rustler and am very satisfied with both setups (I only run it on 2S).

There are other combos out there that will work fine - this just happens to be what I have that I am very happy with,