Bonrager Flare R is $60 and is daylight visible for 2 km. Also has night modes. Both day and night modes have steady and flash. Is good for 4+ hours in steady and over 23 for flash. Also has yellow side marker lights. The also make a Flare RT that can wirelessly be used as turn signals but of course you would need two and the controller unit.

I also like the NiteRider Sentinel ($32-$50[MSRP]). Also lasts over 4 hours in steady and over 20+ hours in Flash but it also has Lasers to create a virtual lane. It has great side visibility as well as straight back. The Cygolite's only weakness in the reviews is side visibility otherwise I would have grabbed one of them. It is a good light for straight back and up to 15 degrees of axis. Instead I ride with these two.

I have a Nitrider Lumina 700. AS for headlights, I feel the more watts, the better. You have it when you need it and most offer various brightness levels which will make them last longer. I get a few hours when I am in 400 watt mode and 1.5 hours in full power. Having the option to dim or a Strobe/Flasher mode is good also for those times when your ride ended up being longer than originally anticipated.

Both taillights have battery level indicators.

Here are some photos of the NiteRider Sentinel by itself. You can see even under a new LED streetlight, it is still very visible and even the laser lines are very visible.

I have the previous year which was only 30 lumens of the Sentinel. The current model has been upgraded to 40.