Best Reports for Monitoring Windows/Sonicwall?

I've recently setup LEM 6.3.1 with Reports. We have Windows servers running local and in the cloud. We also have Sonicwall appliances.

Between the LEM Console and the vast amount of reports it's a little overwhelming.

I've setup some basic rules (group/user account changes and Logon failures.) Can someone suggest what reports and any additional rules you've found useful?