I love my 1016 dont get me wrong, and I think it is well worth even its retail price tag, but I agree with seth, different speakers will sound different. If you are a budget keep the receiver and get different speakers, but if you have the money I think the 1016 would be leaps and bounds ahead of the 515, but you could still get better sound by getting different speakers. If you really like the sony's take a look at the 750's, they sound really good. I suspect the 515 sounds good just as my 514 does, but everyone likes a different sound, so to you, you might not like the 514. Also have you played with the settings on the 515, my 514 has a few, the 1016 has a ton, but when I get the setting right the 514 sounds much better than when I dont take advantage of them.