Ditto on the Rives CD - grand shtuff. Though it does become a love/hate thing, you know? I'd gone through some other discs & done the (trivial, in retrospect) calibration to the RS meter by hand, etc. Then I broke down and got Rives and got a bit more thorough. I also became acutely aware of nodes and stuff like that. Wound up turning the whole room 90 degrees, researching treatments (and doing entry-level stuff), and in the end it was the nodes and the math that kinda led me to just throw up my hands, kick back, and just listen. I did learn a lot with the Rives, though.
You do have to guard against becoming way too anal about it all - I mean, it's not like I've outlined the exact spot for my butt in the "A" listening position or anything like that...