First of all, congrats on your system. You'll love it. I have owned the M22's, VP150 and QS8's (plus SVS sub) for about 2 years now, and wouldn't trade it for anything in this price range.

As to the sound level meter, either one is fine. Some prefer the analog, some prefer the digital. I use the digital, and it works great. Let us know how it sounds once you set it up.