Nikon lenses are as good or better than Canon - it's what they're know for. The good ones are just really expensive. Any of the AF-s lenses are among the top of the industry. Most people choose Canon because of the body. You should look at some of the new Nikon glass coming out. And the D3 - looks like it could blow the MarkIII out of the water, but time will tell.
1999 e46 328i Ti Silver / Black[retired]
2007 e90 335xi Jet Black / Black[retired]
2011 e70 X5 35d Vermillion Red / Cinnamon
2011 e92 M3 LeMans / Fox Red extended