Transparent Monitoring Software

Potential cheating spouse, I need good monitoring software that is invisible. Best I could find/test with trials was Spytech SpyAgent but I'm not sure about dropping $100 without input.

SpyAgent is (supposedly) invisible and can do everything i want except send a live video feed or webcam screenshots to a remote location (but it does other things that I like).

Thoughts? Advice? I'm new to monitoring software...

Thoughts?  Advice?  My thoughts are that you're insecure.  Now, that's not to say they're not cheating.  My advice is to confront them with your feelings and work out any problems.  Go to a counselor even if they won't come along. 

If you're right, then you're going to need help with moving on.
If you're wrong, you're going to need help getting over your insecurity.

4ax0r email with keylogger. that is all.