Actually, the 5890 features pretty much the same video features as most other receivers in it's price range. The denon 2805 is basically the same, just with less power (I think). I have never really seen the point of routing your video through a receiver, since it's just more cable to lose picture quality on. Seems like a laziness/preference/conveinience issue to me, and i personally have no problem with changing the video input channel on my tv for each component I have, especially since it saved me $100 on another componenet or hdmi cable that would run from my receiver to my tv.
Seems like i sort of side tracked there..... No you wouldn't be giving up any audio muscle, it's actually the opposite. Yamaha is pretty cost-friendly compared to some receivers out there, so it's not like ur paying too much extra money just for the yamaha name. And at $850, it's certainly no cheapo either (yeah, I know, there's $6,000 receivers out there, but I think $1500 is too much unless you're running five brand new klipschorns in there!). So if video goodies are minimal, the money is going into those solid 140W channels and other audio processing treats. Sounds like it would fit you perfectly.