Have you tried SQL Nexus yet?  SQL Nexus allows you to import data from SQLDiag/PSSDiag, PerfMon, and PerfStats into a special database where you can then generate reports detailing performance issues based upon the imported data.   Over the next couple of days, I will blog about using this tool as well as the SQLDiag/PSSDiag Manager tool.  I have used these tools only a couple of times and need to refresh my knowledge, so feel free to come along for the journey.  Enjoy!