I'm confusing myself a bit now...... anyways.... I don't think its the data wire of the motor that draws 120mA.. I'm pretty sure they meant the power wires... so now that I think about it... now that I think about it, runaway pancake mentioned the arduino can supply 800mA, hence if both the motors are only drawing about 150 to 200mA, the arduino should be comfortable assuming the current is shared equally between the motors...
Although I suppose all this is guess work at the moment.... I may need to get some ammeters to measure the current or something.... or maybe I'll try using a resistor between the arduino and motors and measure the output voltage with the arduino's adc then calculate the current...