I ended up ordering the Magicshine MJ-818 bike light set from dealextreme. I'll report back later.
I hope you are satisfied after trying it out. And you should know -you can add another light for as little as $40 by buying just the light head.
I run two light heads in blink mode using 6xAA battery pack. It is true that some of the other lights are "just about" as good. But only a Dinotte - or some other big battery-powered light is going to provide the kind of flash of an MS tail light. You can't get that kind of power from most 3xAAA or 2xAA lights.