Oops. I wrote my reply below before scrolling down to your post. You pretty much said it, but since I already posted it too...
These days I use a B&M D'toplight dyno taillight on the Tubus' light bar. I like it because LED protrudes in the center pod. Makes me think of a Groucho nose. It can be seen a good ways away from the either side, which is the reason I chose it.
How do you like that particular tail light? I've tried the ones below, and they're not all that noticeable when viewed from the side.
