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The D5100 has a few things going for it over the D90 - the articulatied screen, and the sensor with more pixels, better dynamic range and higher ISO ability. It probably has better video, too, if that's of interest. Most of the other differences go the D90's way. There's the second command dial, the top LCD, bigger & better pentaprism (vs. pentamirror) viewfinder., and the focus motor for AF lenses. It's a tough call.
If you sway towards the D5100, it's probably worth looking at the D3200 too. I don't think there's much between them apart from the swivel screen and newer sensor.
Similarly, the D7000 is probably worth considering, but given that the D90 can be had for £350 less at WEX it's a big ask. The D90 looks a bit of a bargain; I wouldn't want to be trying to sell a secondhand one at the moment.
Chris
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