So here I stand at my first crossroads as a photographer. I began shooting more seriously this year with a Nikon D70 and 55-200. Being a motocross photographer, it was clear that this setup isn't/wasn't going to cut it. So I picked up a mint 80-200 f/2.8 AFS...and it has been a great upgrade for me. The clarity is second to none and there is no way I could go back. I had the chance to shoot a D2Xs with a 300 fixed, and when I went back to my setup it made me realize that I had a long way to go before I reach the level of quality I'm after. My biggest complaint is that the D70 hardware is so antiquated in terms of autofocus detection. I have lost so many otherwise good shots due to slow/underperforming autofocus. I've tried numerous settings, but to no avail. So here I am. My thrifty side says to buy used, and perhaps buy a generation previous to the current model. However, i realize you get what you pay for, and therefore I want to avoid a cropped frame camera like the D200 or D300. My question is, where does that leave me? Is the difference between the D2X and D2Xs big enough to pay the difference? Or, am I better off biting the bullet and getting the D3 and hanging onto it longer? I have started selling my photos for commercial print/web advertising, so the quality of the photo is becoming far more important then if they were for my own enjoyment. Any advice would be much appreciated!