Sorry guys, I gave the wrong aperture up there... It's 100-400 f/4.5-5.6L USM IS and after checking their conditions I'd go for the $1299 one, but it's hardly any difference in $ anyway. Thank you Mike. I will see what I can find on reviews on it now. I think that's the way I'll go for now. I HOPE someday to add in one of the amazing monster lenses, but I am not going to hedge my bets based on someday.