In reply to:

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And as I and others have mentioned earlier, many popular shows have repeat days or times, so a 2nd tuner isn't really important.

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Trust me. A second tuner is important. I can assure you that you will find yourself wanting it. Listen to the people that own DVR's.

You sound like you've made up your mind so good luck. I do encourage you to read the entire comparison that I linked. That comes from a user who knows from experience what is important in a DVR. (At least read sections 12-15. That's the core functionality and the type of thing you can't glean from feature lists.)

-Dylan