Well, I've just had a pretty massive selling spree and will soon have to make some tough choices. I'm currently without a digital camera body while I'm thinking about what I should do next. I've been pruning my lenses and in a few days time should be down to my Nikon 70-200, 60mm Macro and 17-35 (I may sell the 17-35 too).
The way I see it, I have 3 choices. I'm sticking with Nikon because I still have some nice lenses and I know the ergonomics far too well. The first choice is to look for a second hand D300, the upshot of this is that I will be able to get this pretty cheaply, and having the cropped sensor gives me more reach, length, field of view or whatever you want to call it. I feel that the D300 is both cheaper and better for longer lenses. Option 2 is to try to see whether I can get myself a D700 somehow, this is a far more expensive option and won't be so good with longer lenses BUT the ISO performance is fantastic and it would also give me a beneficial field of view when doing any landscape work (with my current wide-angle). The move to full frame is almost certain for me, the only difference is that if I buy the D300 now, I'd be keeping it as a secondary body later, so then I'd have the advantages of both systems at a later date. The thing is, I've seen a lot of people do that and only go on to sell the DX camera later.
Option 3 is the weird option. I've been using a medium format film body for the past few weeks and have had great fun using it. They're clunky and silly but I've had more fun shooting with it than I have with my DSLR in years. Image quality with the primes available is fantastic but of course I'd have to take into consideration film costs, developing costs, getting a scanner and generally being pompous to everyone because I'd be "hip" and "cool".
Seeing as I've contradicted myself throughout this post I'll leave it to everyone here to work out what I should do. As you don't know me it's entirely the logical course of action
.