Turned down a Braun offer last year after he had just been called up. I knew he could hit and hit well, but with the Brewers playing good ball, I figured Braun's defense would hurt his playing time as the Brewers couldn't afford to have his glove at 3rd. Boy was I wrong about the playing time.
My other huge mistake was a drop of Hanley Ramirez early in 2006. Hanley was K'ing at a terrible rate and I figured the steals he would give me wasn't worth the soon to come drop in BA.
The BA did drop a bit later on, but to my suprise came right back up by the end of the year.