I'll just comment on the audio side since I don't know much about projectors.
Everything looks good to me. I'd throw in the PSB Image line and Paradigm equivalent's to your speaker audition list. You can't really go wrong with Energy, PSB, Athena, Paradigm, Mirage etc. All build excellent HT speakers that perform well with music. You won't go wrong with a Velodyne sub, period.
I wouldn't worry about cables. Aside from buying your cables from Wal-mart, just about anything is going to get the job done. You will not hear or see a difference between Monster or AR's base line or a mega-buck boutique cable. As long as there is nothing physically wrong with the cable and it makes a good connection your fine. If you want to spend a ton of cash for a high-end brand name and cool looking braided looms etc. that's fine just realize that you're paying for marketing hype, nothing more.
The Denon's a nice piece, although some have suggested a good universal remote to replace the touch screen that comes with it. I'd definitely look at the Pioneer vsx-56TXi and vsx-54TX (if you don't need i-Link) for their robust amp sections. The NAD T763 is worth a look also, no auto set-up if that's important to you. Where did you get the Yamaha pricing ? I haven't seen it on the shelves yet in Vancouver.
Good luck.
vermin