I've got the nerd computer and I love it!
I'm sure you already know about the face that can be flipped out and turned 90 degrees, so it'd work on the bars or the stem.
Both the computer and the sensor on the fork attach and detach real easy like all the other knog stuff, so it wont get stolen.
Its a little pricier than that awesomely cheap $10 walmart jobby, but the nerd has that nice durable rubber casing.
The sensor responds real fast to speed changes too.
I can't recommend it enought, get it.