I just bought a pair of those bar-end lights you're looking at. I've only done one ride with them so far, but they seem nice and bright.

I also recommend reflective tape to supplement lights. Lights will only give you a few points of illumination, but reflective tape can light up your whole bike (as long as you're in somebody's headlights). Some good places to apply it are:
Helmet
Fenders (esp. the rear)
Fork and seat stays (or rack stays if you have a rack)
Rims (if you can fit it without taping over the braking surface)