I am trying decide which to purchase. I had a SX 727 years ago but can not find one that is good to go. I have EPI 201 speakers which I have had since the '70s. was with the 727. I am re-gluing the rubber surround to the basket. The rubber is as supple as it was when bought, better. I have am looking at the 750 or 780. I due respect the professionals on this forum. What to do? Thank you.