[PNF]

Ok, I am not too sure which one to get and the rebates ends 7/11/2009.

here are the prices I can get for them, after rebates, 8% cashbacks, 8% coupons and what nots.

All in USD.

70-200mm f2.8 IS USM - $1400 shipped (would love this, but the weight AND price is holding me back)
70-200mm f2.8 non IS USM - $1150 shipped (thinking if this would be fast enough to cover the loss of IS for f4)

70-200 f4 IS USM - $1050 shipped. (current preference)

I am pretty sure that I would be using 70-200mm for outdoor shoot (a walk in the park shoot) 90% of the time. Sometimes, I am likely to do some shoots in the gym or pretty decent-lit interiors. So, my preference is to have an IS model.

But, I was testing the 70-200mm f2.8 non-IS at a shop just last weekend, and found out that, with the wider aperture at f2.8, I am able to shoot pretty sharp images at the mall (decent lighting) at 1/60 speed. (and its heavy!! and the f2.8 IS version is roughly another 0.5lb heavier?) So, i began to think if the f2.8 would compensate enough for the IS model of f4...

So, I guess my question is to those who have experience with the above glasses, what are your thoughts and experience? I know ALL of them are GREAT lens, but I am not sure if I want to shell out $1400 or just $1000-1100...