I'd say the sigma is probably a good lens, but not even close to the nikon. there's a good reason the pros all use the Nikon over the sigma or tammy. Yes the 70-200 2.8 afs vr is expensive, but for a good reason.
The 80-200 2.8 two ring, is a heavy duty pro lens, which was the equivalent to the 70-200 in the film days, it works great on a digital body as long as you use good technique [which applies to all long telles] and give yourself space.
Of cause you would need the d7000 for the motor.
I bought my 80-200 used on eBay for £500 and payed fixation to service it and fix the af ring. Cost £160. The lens is like new.
I'd seriously consider this lens.
Sigmas tend to be soft unless you get a good copy. Sigmas quality control is notoriously shoddy, so if you are going to buy one I'd go to ashop and try it first.
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