The other thing to bear in mind is how often you are capturing the data. I've read guides where its recommended to change the default value of how big the interval is (in seconds) from 1 second to 1 minute, up to around 10 minutes per 'scan'.

Also for a list of all specific counters for SQL2005 use the Dynamic Management View: sys.dm_os_performance_counters

This will however use counters for each DB on the server in question (so you could end up with quite a few!)