Currently running a pair of SB3's that were my father's from back in the '90s, hooked up to Dynaco preamp and power amp. I like the way the horn loaded speakers sound in my system, but have read very favorable reviews of the newer Klipsch bookshelf products that have rolled out since then. My question is, should I go Rp 600m, or pick up a local used pair of RP160m for considerably less money? Is there a vast difference in sound quality between the two? Can anybody speak to the differences between my SB3's and any of the other choices? Thank you so much for any input!