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I went through this before ultimately picking up the 2.8 IS. After everything I've read this is what I've gathered:
-with 2.8 you probably don't need IS if you shoot at a fast enough shutter speed.
-while IS helps it does not completely prevent motion blur. Thus IS or no IS it's not very relevant. I.E. if a subject moves it doesn't matter if you have IS or not. If you have steady hands the 2.8 is definitely the way to go.
-if you rarely shoot indoors I would go with the 4.0 IS.
-for those few times when you do shoot indoors, you could use a flash.
-if bokeh is important to you the 2.8 is the better choice.
Those are the main things I can recall off the top of my head. At the time I was shooting events/concerts as a hobby so I splurged on the 2.8 IS. Otherwise I would probably have gone with the 2.8 non-IS. The 4.0 IS is nice but again if you're shooting in the day time you could always turn up the shutter speed to not need IS.
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