3w luxeon leds cost ~$10 ea RETAIL.
4amp-hr li ion batteries go for ~$40.
these expensive LED lamps are for the more-money-than-brains crowd.
while they do put out some nice white light, theyre not THAT bright. a cheap mr11 or mr16 light is probably going to work better for a commuter.
and as earlier poster stated, if you've got 300 bucks for lights you should look at hid.