Dynamos are great for situations where you'll be riding after dark quite often but don't necessarily know just when or for how long. The dynamo is always there, never needs charging, and will go all night if necessary. But for a regular commute I'd give the edge to battery-powered lights. Pick one that will run long enough per charge for your needs (incl. an ample margin) and you can get a much brighter light for less expense than would be possible with a dynamo. Your $150 price point seems perfect for the MagicShine headlight and taillight combination. Plenty of light, designed for the bumps and long run times common for bicycling (unlike some of the flashlights).