Ok, so my wife and I went to the BX on base so I figured I would take a look, and they had a little bit different cameras then the 2 suggested by apedroza. They had a Nikon DX40, a Nikon DX40X, and a Canon Rebel Digital XT. How much difference is there in the DX40 and DX40X besides the megapixels (DX has 6.1 I believe and DX40X has 10.2) and the difference in the Canon XT and XTI?