Howdy - I'm running 5 Omnisat Micros for surround and centre and a pair of Wharfedales for mains with an OM200 sub. I bought a SPL meter on Ebay after I found out that our former Radio Shacks no longer carry their venerable unit. The one I got was ultimately cheaper anyway. After sitting in my center position and running through the 1070 setup everything seems pretty well balanced now. I will eventually be checking with other frequency tones but it was quick and easy.
Everything I've read about using auto-setup systems has been moderately negative with the system often not setting levels quite right. For $35 and 15 minutes of my time I believe manual setup is probably the way to go.