I'm sure there are plenty who will come here to tell you brushed and nimh are useless, but there's nothing wrong with them to get you going.
Race spec brushed motors have more or less disappeared entirely, the main manufacturers have all moved to brushless so it has killed off brushed motors and the ones available from Ansmann, Etronix, etc. aren't designed for all out performance. It does mean they do last longer than the old race spec motors though.
Your best bet is to pick up a motor second hand. Just posting a wanted ad on here might throw up a choice of motors as there are still plenty of racers with 19t motors kicking around that they would be happy to pass on and a rebuild will get it back to good condition.
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