I don't know the rimfire motors but the specs seem to be ok for the model. Another possibility is the scorpion 3020-12 with an 11*7 apc e. You need to look at your batteries though as I think that you will need more than 1900mA capacity. I think that mine weighed about 3 1/2 lbs so 400-500 watts will give a good performance.
Chris.