Couple of months ago, I bought a 40" Samsung 1080p 120hz for my bedroom. Added a Blu-ray. I would like to add an audio system to it. Keep in mind it's not a large room, and I'm not a techno geek. I would just like it to sound reasonably better than the TV itself offers. Could I do this in the $300.00- $400.00 range? And what would you suggest?