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the D5000 sits just below the D90 only real down side is you have to use afs lens for the auto focus work
where the D90 as you know has an inbuilt motor
Nikon also has just relased the the D51000 slighly better
also as silver snapper said the D7000 is a big upgrade
it all depends on how much you have as a budget
around £400 for the D5000 up to £900 for the D7000
as Silversnapper said the D3100 dont think would be an upgrade
are the lenes you have the AFS versions ? as this could be the major fact in your decsion as only the D90 and the D7000 are the only ones that will auto focus with out the AFS versions lenes
hope this helps
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