Cateye did a lot to make their strada cool. it's small, simple and has a bunch of different configurations.
If you can afford $60, go wireless. It'll look a lot better and be easier to take off when your street cred is in danger.
I doubt that having cadence is really necessary since your cadence is directly linked to your speed. go to sheldon's site and print out a cadence chart based on speed. Memorize it or tape it to your tt.

Another cool thing about wireless computers is that if you find yourself looking at it too much, you can take it off and keep it in your pocket. you'll still get ride info, but without the distraction. I know people who mount their sensor on the back wheel and put the head unit on their seatpost to do the same thing with a wired system.