I have a couple of those Cateyes (the first picture). I also have a Bike Planet 10W which is totally awesome and about as bright as a headlight... but I have LOST it somehwere in the house... for a year now! May ahve to have some kind of ritual to call it forth.
However, I've gotten a lot more comfortable riding with less brilliance.
A note about cheap taillights - boy, what a pain. I picked up a $6 one last Nashbar order and then remembered what happened the last time I did that. THey're not designed to hold together. When I clipped it to the back with its hardware, it just flew off at the first bump; when I fixed it a little more securely to the netting in back, it *still* came apart within 40 miles. It's back together...I don't know for how long.
I also have a reallite http://www.reallite.com/RLHome.htm - it's very big!
The owner's manual is almost worth the price itself (very humorous).
Oh, and the hokeyspokes are a big hit with kids - if I don't get at least one "COOL LIGHTS!" a week I get depressed.
Of course, last time somebody hollered out their window at me, though, it was "Got enough F**in LIGHTS?!?!?" ... Welp, I guess so, you saw me