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I am a big fan of the blackrapid style strap. I use one with my 7D/70-200 f2.8 all the time. But I only carry spare battery and memory in a pocket, so no other stuff like a flash, etc has to be dealt with. and this is for more shooting and less doing other things...
For being more mobile and not shooting as much, I also like my Tamrac Velocity 7X shoulder/sling/pack. I put a body with standard zoom, a wide, and a flash and accessories in it and it works well for me.