So I went ahead and bought the Sigma 70-200 f/2.8 lens and it came in the mail today. This thing is awesome! Its SUPER SUPER QUITE and focus is REALLY fast and accurate. I dont have any photos using this lens yet but my wife and I are going to the Central Florida Zoo tomorrow to test the lens out.
I also bought the Black Rapid RS-7 shoulder strap because of the good things Peekayoh said about it. That thing is pretty cool to.
And a case that holds 3 filters up to 77mm in size