I have reviewed quite a few web og analyzers and finaly decided upon WebLog Expert.
The reason came down to price and functionality. WebLog Expert allows me to schedule, apply various time frames, has the ability to let me specify filters and provides all the necessary functionality that I have been looking for.
Quite a few other's that I reviewed offered more features, at a considerably larger price. The problem was that most of these extra features were not practicle in any way.
I would seriously advise that you check out WebLog Expert for yourself. They have a free (Lite) version as well as a Standard and Professional version. After using the Lite version for a while I decided to purchase the Professional version.