BB_wolfe- I wouldn't suggest the hardware ones. Just now as many features and going to be more trouble the more people you have.
Honestly, I would know what that sucker was if I saw it on any computer. They have been around for a while.
I know most all of the ones you will find readily available on the net will be detected easily by antivirus software. What you would need to do is pay money like 50-100 for someone to take a private keylogger and re-code it for you (my termonology might not be right here but the facts are true)
jelf