Arthur he's asking about the Sigma 70-200 not the Nikkor.
All I can say of the Sigma is their lenses can be slower to focus, I have no experience with this lens though.  Probably the only real advantage of the 70-200 over the 70-300 is that the 70-200 can also take a 2x Tele-convertor which would extend it to 400mm.  I'm not sure but I suspect the Sigma you have been quote is also their Macro 70-200 which has a closer focusing ability.
Personally I think if it was a toss up between 70-300 and 70-200 Nikkors I'd go the 70-200 and a 2x TC if the money wasn't an issue.  The 70-200 is super fast at focusing even with the TC.  However for the money I'd stick with the 70-300, which as Arthur points out is a very good lens.
				
			 
			
		 
			
				
			
			
				MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
			
			
		 
	
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