I suspect you'll find that removable dynamo lights are uncommon. I have not seen any that I can recall. I think it kind of defeats the purpose - dyno lights are always there and always work.
If you can afford it IMO the Schmidt are the way to go. That's what I have. They fulfil the "it just works" requirement very well. Or at least, I haven't heard of any failures other than the "I took it apart and now it doesn't go" ones. I have not seen any Shimano or Sanyo lights that are 10 years/20Mm old, so I can't comment on their longevity, but I own a Schmidt that old and have seen others. It would be annoying to have a dyno hub fail and discover that I had to build a new wheel because I can't get parts for it (Shimano generally support their products for at most five years).
Flickering is addressed in two ways. One is lots of poles in the dynamo, so that even at low speeds the flickering is quite fast (technically an LED light can flicker at any speed you travel at). The other is a small capacitor in the light (or dynamo), so that the flickering is reduced at any speed. My Schmidt/B&M combo flickers at walking speed but once I'm moving I don't notice it. Even riding up hills. I have the standlight B&M, which may make a difference.
The other thing is, don't get hung up about having a switch on the light(s). I don't think it's worth the hassle when the hub dyno drag is so small. I can't tell whether the light is on or not without looking, so when I got offered a better light cheap because the switch didn't work I took it. Now my lights are always on, and have been for over a year now. I still don't notice the extra drag.
FWIW I think the ReelLights are a cool idea and great as extra lights, but I wouldn't have them as my only lights. They are too low and flash too slowly (and they're not bright enough). But then I have a superflash light on the back of my helmet as well as the dynamo lights on my commuter bike. And another battery light under my seat. And reflective tape on the frame and mudguards. So perhaps I'm not the best one to comment on that issue.