Hi, I'm a long time lurker here and am blown away by the knowledge and hospitality on this board. You guys really have it going on. I am wondering if you guys would help me out. Please keep in mind that I'm not all that knowledgable, especially when it come to technical jargon. Thanks! My system is 4 years old. I have B&W 601s1's, cc6, no sub, no rears, Sony 33ES receiver. I'm in a 500 sq. ft. NYC apartment and there is literally no room for rears. When I bought this system, I figured I was 70% music, 30 HT and wanted to take my time putting the system together. Now that I'm out of grad school, that ratio just about reversed. I've had my system for 4.5 years now and I'm getting bored with it and now feel like stepping up and really improving what I have. Which brings me to my questions: 1) Having no sub these past years, have I done any damage to my 601's? 2) I think that my best bang-for-the-buck change would be a good sub. (Due to the size and setup of my apt., surrounds wouldn't work). I've scoured all the threads here and have it narrowed down to the Rava, HSU, and Velodyne CHT-15. I've eliminated the SVS's b/c of their size and b/c, well, I don't need that much base and I've got neighbor problems as it is. I've never had a sub and want to really FEEL one on movies w/o sacrifing too much accuracy on the music side. Oh yeah...I'm really not technically inclined, so I'd want some great customer service...I'm leaning heavily towards the Rava but have an open mind. I would be willing to spend the extra cash on the Dharma (I'd go up to $650 for sub) but I wonder if it's worth it. I'd hate to be dissapointed in a sub but down the road I suppose I could always add another Rava or HSU if I need more base. Any thoughts? I don't know much about the Velodyne. 3) I know this isn't a speaker question, but - I have the opportunity to get a Rotel 1075 Demo for about $550. I've wanted a rotel amp for years (I originally demo'ed by 601's on rotel) and think this is a great price. I assume this would be a big improvement to my system? 4) If I had to choose b/t a new sub or the Rotel, what do you think is the bigger "difference-maker"? I could likely afford both. Seems like a big improvement for my system for "only" about $1,000. Any thoughts/advice would be great. Thanks so much!