Originally Posted by deltawake
You certainly don't need the f2.8 for wakeboarding. The f4 either IS or non-IS is a beautiful lens for wake shots. If you want to shoot indoor sports or lower light stuff, then the f2.8 is very nice. I have an f4 70-200 non IS that is sharp sharp sharp.
I agree with you on this one, but there really is no substitute to the 2.8. I have a Nikon d90 and have shot both an f4 and an f2.8 and have no bad things to say about either, but you really can't get away from the crisp, sharp and versatility of the 2.8. Price is the big factor! Good luck with everything and be sure to post some pictures when you decide what your going to end up doing!