Another vote for the Knog Blinder R70, which is the one with four leds, the bottom of which is a very bright one.
I think this is all a bit context sensitive in terms of location, traffic levels and whether it's dark, dull daylight or twilight. For example, in urban and suburban areas, where there's lots of traffic and street lighting, then the above may well be true: sight-lines are quite short and people are expecting (should be) bikes and side junctions and stuff all the time when driving, and if they fail to identify a 'bog standard light' as a cyclist then they quite possibly won't spot a brighter or flashing one either.
On the other hand, on rural roads, brighter lights, especially if they're flashing, actively draw attention to the fact that there's a bike from quite some way back. Again, in actual darkness, the difference is smaller, but from experience driving around the Dales, small, non-flashing bike lights are considerably less noticeable than flashing and/or bright ones when the conditions are dull daylight or twilight.In those conditions, bright and flashing works an awful lot better; at least it does for me when I'm in a car Human vision has allegedly evolved to favour noticing both bright things and moving things, so flashing(moving) combined with bright seems a good idea in rural areas, whereas in a town, with entirely different conditions, I'd stick with 'bog standard' to avoid the lighting arms race.
