The TSR-5810 caught my eye. Didn't jump fast enough when the TSR-7790 was available at CostCo.
If we were to just utilize the weight presented by the CostCo site of the TSR-5810 and the Yamaha site for the TSR-5790 and TSR-5790, we could determine it must be software or the arrangement of ink.
Then again, this logic proved harshly false in Monty Python and The Holy Grail.
That said, I'm happy per-dollar-spent. It took me over an hour to set up, this isn't the same world that setting up the stereo after a move in college is. BE PATIENT. RTFM -- Read The Manual!
To take advantage of the bi-amping and auto EQ with their little microphone, placed in the sweet spot of the listening area was worth the ego punch of following instructions instead of just plugging stuff in.
I do wish to have more headroom for my Dunlavey's, but hey, a sub-$500 receiver to drive a pair of 20-year-old SC-III's, SC-Iav center and NHT Super Zero surrounds. Should be sufficient to handle the internet, iTunes, and YouTube sources and does surprise me when watching a Blu-Ray or using the system for mastering home-brew recordings ( yeah, as compared with so much crap that is pumped out of CakeWalk or GarageBand directly from computer to internet.
I could be out on a limb.