profiling and profilers

Hey Guys

I have been using the Netbeans profiler and have had trouble pinpointing an issue we are having with autogenerated reports not running to completion with byte [] and byte [][] hanging on for many generations and the heap growing and growing while the massive amount of info is gathered and Chart Director graphs are assembled. I don't know that much about the profiler as i have used it sparingly in the past to find simple memory leaks. I am thinking i would like to take a course on all the ins and outs and i am wondering is anyone has any suggestions on what the best profiler to use would be as well as a decent course to take, either onsite or online.. It is paid for by the company but i don't want to go with netbeans just cause i am familiar with it rather than get some educated opinions..

Cheers
Greg