Why does a pair of LSR30Xes cost $82 more than the LSR305 (currently $99 on at JBL, Amazon, and other places)? Can anyone who has heard both compare the sound of the two products? Is it the "matching" of the two speakers that I wouldn't get if I just ordered two individual $99 speakers? Then again, what if I later want to get a third one for a center channel. At that point would I be better off having two 305s instead of the 30Xes, so that I can then buy a third 305 that sounds like the other two speakers?