Depending on the security situation, and the be-seen vs. need to see issue, there's a whole range of lighting.

For the back, the infamous Planet Bike Superflash. Get 2 and set one in blink and one on steady mode.

For the front I'm only familiar with "need to see" lights:
The L&M Solo that MikeOnBike mentioned is great. It's bright, it's got a wide spot, and it does last for the advertised 2.5 hours. Plus you can helmet mount it, or pull it off the bike if you have to lock up outside all day. And it's under $130.
If you're willing to spend a bit more, I've become a huge fan of generator lights. The new LED lights are really bright and with the generator, you never have to worry about them going out. The IQ Fly or IQ Cyo are not expensive; the cost is really in the wheel itself (but you can get inexpensive generator wheels for under $200, so a total cost would be around $300 (which is less than you can spend on a really strong battery powered light.)