Regarding the 3W luxeon bulbs... I use a dual 3W luxeon setup, and I can tell you that these are very good for being seen, but will not light your path in the way you're expecting. Maybe my optics just aren't focused properly (too wide?) but the beam these two produce together can't even wash out the yellow glow of a streetlight. Without the streetlights on my commute to help with the lighting, I don't think I'd feel safe riding at full speed.

They are very good at illuminating street signs and pointing into driver's eyes, however.

I'm actually thinking of adding a high-beam to my light array for my morning commutes. I now leave my house long before the sun is up, so I need a bit more light. I'm considering a 10W halogen for this setup....