D700 is a better path if you only take still images. Video capability in D700 is limited compare to D7000. However, the large sensor and low noise in low light condition allows you to take expressive images. If you are buying a used body, the cost between the two is about the same. You can start off with your existing 50mm and maybe add another wide angle zoom lenses with a large aperture for your landscape and travel.
Which camera do you recommend for HK-Lam?
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d700 wud be a real upgrade for you considering the existing d90 - but if u want new features and use existing lenses you may consider the d7000
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Well, if you were a wedding photographer than, i would say you must buy D700 and use it with 50mm. And on D90 just put that tokina lense.
But in your case, I would suggest to buy maybe even D3200, or wait D600.


