On the rear I’ve got an Exposure TraceR & a Moon Pulsar with rechargeable AAAs.
I use this combo because the Pulsar lasts for ages on it’s AAA and is pretty bright.
The TraceR is brighter, but doesn’t have as good battery life. I can get away with not charging the Moon light very often & being confident that it will still have plenty of juice.
On the front I use a Ravemen PR1600. It is a really good light and was a bit of a no-brainer when I saw it on fasttech.com for £50.
From your usage description, you could probably get away with one of the lower priced models.
It has plenty of modes including a ‘be seen’ mode (it’s not called that) which has the road beam on ‘low’ and then pulses brightly. I think the LCD displays 27 hours battery life in this mode.