I have a Denon 1700 and I believe its one of the first Dolby Digital receivers that came out when I bought it. I'm pretty satisfied with it but starting to notice that alot of DVD's are out with both sound tracks DD and DTS. I look at a couple of Yamaha receivers like the 550 series with 90watts per channel and I'm very interested in changing in the future. Would anybody would change from a Denon 1700 to a Yamaha?