I use a D70 myself and I am considering a SB-800 unit (I've tried a co-worker's on several occasions, and with a reflector and 90° angle, I liked the results).
Your solution, however, seems very low-cost and might be a good alternative. I'm wondering how you trigger these small units, however ? Do they automatically react to the built-in flash unit ? Or is there some more advanced magic going on ?
The slaves have a sensor on top of them that triggers when they see the built in flash. The built in flash needs to be set to manual mode so that there are no pre-flashes to prematurely trigger the slaves.
The range for the slaves is about 40 feet indoors and up to 30 feet outdoors.