Where will you be using it?
I probably use my 70-200 for 70% of my ski/snowboard shots, and it's a hassle to carry around more weight than needed.
I got the f/4L IS version, and it both weighs and costs 50% of the f/2.8 IS here in Norway.
Don't really need the IS, but the IS is abit more weathersealed than the non-IS one, that goes for the f/4 version atleast, don't know the f/2.8
Read up on Dan's posts in his blog.
You got to decide if you will be needing the f/2.8.
The DOF is great on a non-crop sensor, but I rarely shoot mine at f/4 anyway
