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Hi James,
I think you're highlighting a particular quandary that many Nikon D90 shooters who are looking to upgrade are going through at the moment. For many this decision will be made on their budgetary constraints and the compatibility of their current lenses with the new camera body they buy. If you have to swap your entire collection of lenses this makes the upgrading from DX to FX an expensive task. However, you have 2 x FX lenses and 2 x DX lenses in your collection, so this blurs the boundaries slightly.
Now you currently don't have any wide angle FX lenses in your collection, so if you were to go for an FX camera you would need to buy a wide angle lens with it, so you still could cover the same range of focal lengths as you do at present. A D600 can be purchased with a 24 - 85mm lens for £1799 at the moment, so that would be your minimum spend. If you were looking at a D800 with the same lens, you'd be looking at £2450ish and if you went for the very highly rated 24 - 70mm it would set you back about £3300 for the camera and lens.
So, if that is way out of your budget, what other options do you have. Well you could look at the ageing but still excellent D700 as a good secondhand option or look at staying with a DX format camera.
I can't say too much on the D7100 as it not been launched to market yet and as such there are no full reviews on it at present. I tried it at Focus last week and was quite taken by it. It certainly handles very nicely and they've address every issue there is with the handling/ergonomics of the D7000 that I currently own. If you're planning on taking a lot of wildlife images, then the 1.3 crop mode will be of great interest to you with the D7100
So James, are you ready to go FX? Do you feel you need to go FX? Can you afford to go FX? Will a DX format camera have sufficient capability for what you intend using it for? These are some of the questions you will have to ask yourself before you can make a decision.
All I would add is that you try each of the contenders for size before you buy and see which one you're happiest with, because this will be your camera which you will be using and what suits you is the most important thing to consider and not what I or anyone else has to say on the matter.
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