I used to use my D70 18-70 "kit lens" for wide angle needs, but since I "gave" the D70 to my wife to use, I need another wide angle lens. The way I see it is, I have 3 lenses to choose from. The Tokina 12-24, Nikon 12-24, or the Nikon 17-55. My main question is this...are the 12-24s really that much "wider" than the 17-55? Would I gain anything by going with the 12-24 over the 17-55? Any input would be greatly appreciated. BTW, I plan on using this lens on both my D2x and D2h, with possibly an occasional D70 shoot.