I will be needing another Nikon body (in addition to my F3P/MD-4). I have boiled it down to the N90S/MB-10 and F4S. The F5 is too expensive, and I actually prefer the N90S to the F100. I have had both, and the N90S feels more "solid," even though there is more plastic in the N90S. I have handled the F4S only briefly. For me, the main advantage here for the N90S is that it can take CR123 lithium batteries in the MB-10--which would be very good for my cold weather shooting. This would seem to trump even my F3P's capability in the cold, as the ni-cad pack for the MD-4 is very hard to come by and rather expensive, too. I like the F4S' knobs (rather than a screen), but, otherwise, I do not have much familiarity with this body. I will be using AI, AI-s, and a couple of non-AI lenses (no AF lenses). I welcome your comments and perspectives.