I Use the IS on my 24-105mm quite a bit, its quite useful for cheating an extra stop out of the shutter speed when i'm working indoors. Not much use on a bright sunny day, as mentioned, but if the clouds roll in it can help keep things still.
Have you looked at the sigma 70-200? that gets good reviews and has an AF motor similar to Canons HSM, so that would probably sort your AF problems.
The other approach would simply be to learn to pre-focus well. Regardless of whether I'm using my USM lenses or not, if i'm shooting action I usually manual and pre-focus.
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