Thaks for the replies guys!
rklepper, I realise that the IS wont help at all for sports, and the type of sports we play over here are generally in very good light, either a bright overcast day or direct sunlight, Anyway, the reason I have decided to go for the IS is that I want to also shoot some parties and some will be low-light, but I also plan to get some faster glass apart from the 50 1.8 and the 70-200 2.8. I also really love aviation photography and have decided that the IS mode 2 will help a lot for panning shots.
Mike