I am fortunate to own a D3X and D3S (both reliable workhorses that have given me no problems and to which I am much attached!) However, I value a good pixel count and keeping up to date, so now that I have funds to upgrade one camera what should I consider doing next? Should I go for the D800 (to replace the D3X) or the D4 to get a few more pixels and other improvements from the D3S or wait for a possible D4X or D5, if such a camera is produced? Or should I just wait and see as any improvements might be minimal? I am an amateur photographer with interests in all fields except portraits. Forum members wise advice and opinions would be appreciated as I have no idea where Nikon might be going next in its high-end DSLR kit. Thanks.