the 570 is onkyos entry level HTiB system, small speakers and less power.
the 770 is a step up, larger speakers and considerably more power.
the 760 is last years model, it was replaced by the 770, it has more power than the 570 and less power than 770. the speakers are exactly the same as the 770, with the exception of a 8" 150 watt subwoofer, as opposed to the 10" 220 watt subwoofer that comes with the 770. it's hard to find since they haven't made it in a while, only get it if you can find it for under $349 or so, otherwise look for the 770...
i personally don't like the 760 or 770, simply because i don't think the speakers sound very good, but that's just my opinion and yours may of course differ. honestly, there are some great deals on other HTiB system right now, a perfect example would be both the Yamaha YHT-450 and the Yamaha YHT-755 HTiB systems. they're KILLER deals at those prices, you should look into both of them, i would personally go with the 450 over the 770, but that's just my opinion...
the 770 is a step up, larger speakers and considerably more power.
the 760 is last years model, it was replaced by the 770, it has more power than the 570 and less power than 770. the speakers are exactly the same as the 770, with the exception of a 8" 150 watt subwoofer, as opposed to the 10" 220 watt subwoofer that comes with the 770. it's hard to find since they haven't made it in a while, only get it if you can find it for under $349 or so, otherwise look for the 770...
i personally don't like the 760 or 770, simply because i don't think the speakers sound very good, but that's just my opinion and yours may of course differ. honestly, there are some great deals on other HTiB system right now, a perfect example would be both the Yamaha YHT-450 and the Yamaha YHT-755 HTiB systems. they're KILLER deals at those prices, you should look into both of them, i would personally go with the 450 over the 770, but that's just my opinion...