I found myself in your exact position. I played with the 350, moving it around my house searching for a sweet spot that would add to the ht experience. With music, I thought it was great but with movies it wasn't adding to the experience, IMO. So I got with Axiom and arranged an upgrade. Since doing so I have no regrets. I absolutly love this thing. The family watched the 3rd Harry Potter and Jurasic Park last night and it had the house shaking. The 350 was good but the 500 is awesome. My wife was impressed with the windows rattling! I say go for it. You won't be disappointed.
