Best commuter option is a hub dynamo and a decent light. Cost will be less than the Hope vision, but more than the DX (mine were about 150 all in). You will never forget to charge them, or forget to bring them with you, and they will never run out of battery. Not as bright as the Hope, but then you're only riding roads and wide off road tracks?
The downside is that they are commuter specific – not really good enough for technical offroad, whereas with the hope or DX lights, you'd have something for nightriding at other times too.
Lots of info on these threads:
http://www.singletrackworld.com/forum/topic/recommend-a-front-light-for-my-commute-with-low-and-high-settings
http://www.singletrackworld.com/forum/topic/new-dynamo-bits-n-pieces
Joe