<font color='#000080'>Yeah, SPL meter from the Shack ($45) and an Avia or similar setup DVD. It's often more accurate for tweaking your system and doing phase checks (surrounds vs. front, etc...)
The SPL meter is mandatory, but the DVD setup disc you can skip if you have any THX DVDs (Star Wars, etc) which have a THX setup program on them - very handy in a pinch.
Your receiver/pre-pro will also have pink noise for setting levels, but we've found they usually aren't as accurate as those found on the setup DVDs.</font>