A site that I think is well laid out (especially considering the the number of forums they run) is http://www.hometheaterspot.com. I'm not particularly fond of the layout of avsforum.com, but if you can wade through it, there is a tremendous amount of info available there.

I absolutely agree with Spiffnme's point that the owners seem to be the best evangelizers for a given company on the net. Rocket owner's love their Rockets, Axiom owners their Axioms, etc...

Good Luck on the presentation.