i also have a 70-300 crappy G lens and a sweeeeeeeeet (gayyyyyyyyy) quantaray 18-50.QUOTE]
I think I will continue to get Nikon lenses. Ken Rockwell puts it in a away I can understand when he says that all camera makers are really lens makers who also make camera bodies. This is evidenced by the fact that both Nikon and Canon also make very VERY expensive lens products for TV cameras, microscopes, and even the lithography machines used to print microchips. These sell for tens or hundreds of thousands of dollars and are made to extremely tight tollerances. Neither company makes high-end cameras for these same industries.
Anyway, I think the point is that both Nikon and Canon have a leg-up on Sigma, Tamron, etc when it comes to lenses, especially prosumer or professional lenses. I'll continue to buy Nikon gear. But that creates its own problems becuase I can't afford a lot of gear.
Now that I think of it, what happened to your 18-70mm lens? Or did you not purchase your D70 as part of a kit. Also, are you an art student? What SW do you use to convert your NEF files?