I've got a Cateye Strada (wired), which I was able to pick up for a relative song when REI had a special sale on them a few months ago. I'm quite happy with it. It's my first computer and it does everything I want it to. I was also considering one of the computers from Planet Bike, but then I realized it wouldn't mount on my stem the way I had hoped, so I went with the Cateye.

Mine doesn't do cadence, but I'm OK with that; I'm not racing... I use the trip timer measure off 15 seconds while I count pedal rotations and then just multiply by 4. Good enough for me to have a rough idea of what my cadence is and what different cadences feel like.