Congrats. It seems some folks always feel compelled to rain on the parade.
That's a very good price for a non "white box" lens bought new. Best Buy has become very aggressive about matching prices, which I appreciate. I'd rather buy from a real store that employs local people if the price premium is not too great. (One reason I shop Barnes and Noble rather than Amazon whenever possible).
Did you use your Best Buy Card for the free financing? Don't forget to add the value of that into your savings if you did.
Oh, and this is a great all-around lens by the way.