Mr_D -
Have you already purchased the Tivo? I just wanted to mention that I bought the DISH PVR 721 and my wife loves it. It has two tuners - you can record one show while watching another or watch a previously recorded show while recording up to two more at the same time! It has a nice GUI and is easy to use and has been reliable. Also, if you buy a Pay-Per-View movie that is in Dolby Digital (many are) it will output the Dolby Digital signal during playback for true 5.1 surround during playback. We use this feature a lot - hardly ever run to the store to rent a DVD anymore.
I had not seen anyone else mention the PVR 721, so I just wanted to let you know my wife and I love ours. And if you are new to DISH you can get one, along with the dish itself and installation, at a great price.
Finally, I imagine you will love your separate amps. I have seen firsthand the difference a "real" amp can make several times - it is not subtle. Most receivers simply do not have the high-current available that is needed to give a big, open soundstage with a lot of "air." I expect will be going back soon for 3 more amp channels! BTW, I highly recommend buying at least one more channel right now upfront - the center channel carries the majority of the load during movies and would benefit greatly from a dedicated amp channel.
Hope this additional info opens up another possibility or two.