Oh I think we can beat either team at home. I just think that without Harvin, it would have to be a dominant near-shutout performance by the D with multiple turnovers (and even multiple turnovers aren't a guarantee as we've seen our offense fail to generate TDs despite a truck full of short fields against the Giants, AZ, and NO).
Based on the last 5 games, I just give our passing offense (without Harvin) zero chance against a team we cannot run very well against. I'd love for next week to be the week they defy this trend.
Now, our defense has been giving us those performances all year, so it's not outlandish at all that they might come up big again.
With Percy Harvin, I think we could possibly survive a game where our defense merely holds the opponents under 20 and doesn't generate multiple turnovers.