Congratulations Oz on your new purchase!!! Consider it as a home trial!!!
For your big room, I think that you probably need to get a better amp. (and yes, I would strongly suggest separates). At least a 100 wpc two channel amp. It will give M60s the punch or "oomph" that you lack now. My Rotel RB-1080 is 200 wpc at 8 Ohms, in a 24x20x9 room. I can tell you from my experience with them and Rotel gear I have had and have. Again, more power does not ONLY mean louder, it means better.
Me too, I like to listen to my music loud.
As for the sub, I can't tell you a lot, since I don't have one. However, many say it is very important, even in a stereo setup. I still have to wait before I have one.
