Get the Canon 70-200 L with IS.
I've got the Nikkor 70-200 f/2.8 VR and wouldn't get rid of it unless something really really good came along. Sigma is definitely not as good as the Nikkor or Canon.
What I'd like is a Nikon AF-S 400mm f/2.8 VR II ED

But $11,000 is a
little to much for an amature like me
