The big advantage with Pentax is that every lens becomes stabilized- including primes, none of which come with VR on Nikon (unless they're longer than 100mm). Also, the user interface is generally more friendly and you can make adjustments much faster in the field (thanks to the hyper program mode). Nikon's advantages include faster AF, manual video controls, and more weather-sealed lenses. The general IQ is going to be the same as both cameras have the same sensor, as you've already mentioned.
If you go with the K-5 (classic), you'd have a bigger lens budget, so that would be one thing to consider. On the other hand, if you plan on getting a D800 once you can afford it, maybe it would be a better idea to start with the D7000 and invest in FX lenses, upgrading just the body later on.
A SDM teleconverter is on its way from Pentax, but you can already get a TC from Sigma and Tamron for traditional screwdrive lenses.
Overall, both systems are great. If you're a prime shooter, Pentax is your friend. If you often shoot stuff that's moving, then Nikon is your friend. But don't forget that thousands of cheap legacy lenses work with Pentax, such as the
K 500mm F4.5, which is really, really sharp
As far as tethering goes, both cameras can do it, but only the Nikon has official software (PK_tether for Pentax is free & community-built).
Adam
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