Gah! I want that soooo bad.
But even if I sold both of my 300 f/4 IS's AND my 70-200 2.8 IS, I'd barely have enough to cover it, and I don't know that I'd ever sell the 70-200 2.8 IS.
(Don't ask how I ended up with two 300 f/4 IS's, but if anyone wants to buy one, let me know :))