I'm considering gradually changing out my HT from RTi to Lsi. I have a 7.1 set up and I've already switched out the rears from 38's to 7's. I was thinking that my next move would be to change out the rear surrounds from 30's to FX's. I haven't heard much about the FX's on the forum. The cheapest price I've seen for them is $579/pair NIB. A used pair is selling on audiogon right now for $600. If I went with the FX's, I'd sell my 30's, but is it worth the extra approx. $400 bucks for a timbre matched set up in the rear?