I seem to have lost my current commuter light, L&M Taz 800.
I really liked the light and it worked well. I generally used 400 lumens, with 800 for exceptionally dark.
My one complaint is that under large bumps the light would tilt down (front-heavy).

Key features:
Self-contained (easy to move between bikes)
>600 lumens
USB charging (it's just easier).
Good mount (GoPro adapter is a nice feature)
Budget ~$100

Currently considering:
1) Niterider Lumina 750
2) L&M Urban 800

What other models am I missing?