Buying from Amazon vs. Tivo

I have a Tivo HD that hasn't been setup since we moved almost a year ago, and my wife is getting intolerant of not having a DVR. If I'm going through the setup process again with Time Warner, I want to upgrade. The Tivo Summer Sale got me fired up, but then I waited too late and they sold out of the Roamio Pro. I'm thinking I want to get a Roamio Pro and 2 x Tivo Minis.

I've got a couple of questions about buying new from Tivo vs. Amazon. If I buy from Tivo, I get the following pricing:

$599 Roamio Pro
$399 Product Lifetime (multi-device discount)
$39 3 year extended warranty
$149 Mini
$149 Mini
$1339 Total

I can get the equipment from Amazon for the following pricing:

$455 Roamio Pro
$130 Mini
$130 Mini

I would save $182 on the equipment by ordering from Amazon, but my questions:

- Will I still be able to get the service discount of $100 buying Lifetime separate from Tivo.
- Will I still be able to get the extended warranty from Tivo for $39

If those are both yes, help me out with why I would want to order from Tivo and what I might be missing here? Any other value in buying direct from Tivo? I'm guessing I could more easily return the whole lot if I was unable to get it to work correctly but since I've had a Tivo HD with Time Warner for many years, I'm assuming it will all work.

Thanks,