Was going to say....stuff the f/2.8 zooms and get a 85mm f/1.2 but don't know if Nikon do one! (there's an old MF one but don't think it works on modern Nikons....works on new Canons via an adaptor apparenty )
Seriously tho...I'd forget the lardy zoom and get a 50mm f/1.8 and probably a 85mm f1.8 (or faster?) and take the change from the £750 to the pub