I've run brushed with 1S. 19t is nice...for five minutes. It simply draws too much juice. Your best bet is to go with a standard 27t stock motor, lightly sprung: greens. I used a CO27 and could make 8 minutes run time. Roll out around 60mm. It won't be super quick, but it's not that bad.
Get your class going, have fun, and move to brushless when you can afford it.