No case is neccessary.
Nice lenses should be displayed like Bling. I would suggest a Black Rapid strap for comfort while you wear it.
LOL. Way ahead of you - I got a special BR strap just for the 600 II.
(Actually, I'm serious! BR has a 'left handed' version of their strap, and for the life of me I couldn't see the utility of it since, right or left handed, you've got to hold the camera in your right hand to press the shutter button, so having it hang on the left side of the body seems illogical to me. But with a heavy supertele, if makes a lot of sense to hang that on the left side, since when you bring it up to shoot you want to lift it by the lens foot, not the camera body, and that means lifting it up with the left hand then grabbing the body with the free right hand. But...I digress...)