I'm a realist, so on most seasons I'd agree with you, but this season, with the strength of our midfield and attack I honestly think we're a stronger team. But you have the scoring machine Van Persie. If you can keep him fit for the season, it'll be close.
And in all honesty, with how inconsistent Chelsea are at the moment, Spurs and Arsenal could finish 3rd and 4th. How sweet would that be? (I particularly dislike Chelsea, and Man City!)