Not knowing what type of display you have, my choice may not be relevant.
For $1100 you can get the Denon 3808 from Sixth Avenue. I’ve had bad luck with Marantz and suggest you consider that purchase very carefully.
I’d then buy a Toshiba A35 for about $400 and a Panasonic BD30K for about $425. The combination of those three will give you the ability to hear all the new audio formats, and you’ll probably get better stereo sound as well, although that one’s harder to qualify than the surround improvements.
You will get more “wow” (both audio and video) by going HD over upgrading the speakers you have now. If anything, I’d swap out the surrounds you are using with some QS8’s before upgrading the rest of them. The Q’s are probably the best surround speaker made.
