I just had 3 break as well. I'm going to try some sapim strongs, which are 2.3mm (11ga) butted at the elbow, and 2mm (12ga) for the rest. These are $1.95 in black with alloy nipples from wheelbuilder.com
After reading up on it, the consensus seems to be that butted is better than straight as the thinner part can properly stretch, and that the china-brand spokes that come with any of the hub motors are less than half as strong as quality ones.
Ryan,
What length did you get these spokes or did you cut them yourself? Trying to get them pre-cut and looking for the proper length to order.
Thanks!