Could anyone advice me as to whether it's worth upgrading my current Mission M71i speakers to a pair of B&W DM602 S3's ? I'm am looking to upgrade my current speakers because, although I'm relatively satisfied with them, to me they don't sound dynamic enough (forgive me if I've used the incorrect term but by that I mean bass light). I've heard the B&W's excel in this area which is why I'm very tempted by this set, it's main use is for 2-channel stereo rather than home cinema. My question is basically will the improvements in sound justify the £300 expense? Am I better off either sending more money or keeping my existing speakers? Or could you suggest alternative bookshelf speakers for £300 to £400? Yes I know, I should demo these speakers and decide for myself except nowhere local where I live has these speakers so I have to relly on advice from these forums. Thanks for any help/suggestions!