Very good article but you should add trace files to your option for auditing. I'm currently using Idera's tool which uses this method and been pretty happy with the results. There are some bugs and work around needed but no software is perfect.

This process is obviously bit more invasive then reading a log file but from what I've seen the impact is not noticeable... especially since the actual manipulation of the trace files should be on a separate server. One possible downside though, is that you will not have the actual data manipulated like you would with a log reader or trigger, instead you would just have the DML statement. On the positive side, you can audit login activity and SELECT statements.

David