I'm a Cygolite fan - I've been using the Expilion series for years (currently on the 850). I usually use it on steady on the third lowest setting (unless out in the country at night), and it also has a less offensive than usual night pulse mode that I like around sunset. The Hotshot 100 rear light is great on steady at night, with several good daytime visibility modes (though they are honestly a bit too much for group rides). The 80 would probably be sufficient, and I think the 150 might be overkill. Both are USB rechargeable.
The downside to the Expilion is that it is not especially light, or aero, if you are interested in such things.