I have been looking at the EF 70-200 F4L lens vs. the 70-300 f/4-5.6 US ISM lens. The reviews online show that this is a typical comparison and then say it just depends on what you want. To me, I was leaning more towards the 70-200 f/4 (NON IS) because I could always get an extender - then I would most likely want to have the IS. The cheap in me says just get the 70-300 because I am an amateur and that will be plenty enough lens for me.
Any thoughts? Anybody go through the same decision process?