Quote Originally Posted by neuroanatomist
Hope you have big rooms in your house, or are planning on shooting mainly closeups of your family. 70-200 is a little on the long side for shooting in typical rooms, IMO.

True, so I guess mainly compare the two options for tighter portraits. I'm thinking usually you'd want a flash in this case anyways... so f2.8 wouldn't be necessary. For now I'm leaning more towards the f4 IS... though I guess I don't need to worry about it until after my 10-22 purchase. Maybe by then the f2.8 IS will be around $1000 since the mark II version will be coming out.

Thanks for all of your advice.