A List Of Things Thrown Five Minutes Ago

ADVICE SOUGHT: So, yes, Jen and I are finally going to get TiVo. I just want to make sure we're doing this right. We have an HD-capable television at home and Comcast digital cable, which currently is broadcasting a few channels in high-def in addition to normal.

My questions:

1. Is this 80-hour unit on sale at Amazon what we should be buying? Is there an argument to be made for (a) buying it at a retail store, as opposed to online; (b) a different type of TiVo unit; or (c) a different unit (ReplayTV?) altogether?

2. Is there any reason to wait for a next-generation model at this point?

3. Should we be purchasing the lifetime plan or monthly service?

4. Is there anything else we need to know?

Thanks for your advice. The Comments section is open for business.