The Cat Eye headlight you list is essentially a 'to be seen' light only. Meaning if you're riding on well lite or partially lite streets, you'll be fine because you'll be relying on the street lights and car lights as your primary source of light. If you try to use this headlight on a pitch black side street you'll be able to see a small spot in front of you. It's enough if you're willing to go slow and/or you know the territory.

If you are traveling on well lite or partially lite streets and you feel being seen is more important than needing more light to see, I'd suggest a strobe. Cat Eye makes a 3-LED one I just bought at REI for $22.

I don't know about the tail light. I have the 10-LED Cateye light. With fresh batteries it is enough to hurt your eyes if you directly look at it. I'm sure there are brighter ones but I don't see the need. Keep the light high up near the seat. It puts it more in the line of site.