Ok after laying out all the options on the table, the minister for finance and I have settled on the d300s.
Reasoning - It is cheap, provides a significant enough upgrade for me, comes with great glass (almost a free body at the price listed!!) and will make a great second body when I do upgrade to ff, and I'll still have great dx glass for it.
If for whatever reason I do decide that I'd be better off with a d7k then I will sell the d300s body and d90 and fund it that way. In the meantime if I win the lotto or get a very substantial tax refund then I'll go the d700 and glass option in addition to the d300s but at this stage the reality is that it's beyond what I can realistically afford.
Thanks for the useful comments all
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