Hi, I am looking at two B&W speakers now, one of them is the DM601 S1 for $400(a pair), while the other one is the higher model of DM602 S3 for $700(a pair). Both are used speakers and broken in already, and no tax is needed since it's from my friend. Now is there a BIG difference in sound between these two speakers????? I owned a B&W 600 older series, and to be honest, I am very impressed with them for these past 8 years. So wanna get another set for my rear or centre. And yes, money is an issue for me here, so unless the DM602 S3 has a much better sounds over the 601, then I would consider that one. Any experts or audiophiles out there that can help me on this?? Greatly appreciated.