not what other people say.
regarding lenses, if you're into primes, then get the k5 (w/o the oil stains
)
if you're into zooms, get the D7000. there's MORE 3rd party support as well.
tamron just announced a new 18-270 VC w/new piezo AF drive for CaNikSony. nothing for K mount.
the tamron 70-300 VC USD also in CaNikon mounts. nothing for K and i can tell you, this is a great lens.
of course, there's always sigma.
nikon has hot pixels in video in some d7k's. they came out really quick to acknowledge and will be issuing a new FW fix. that is really commendable.
pentax has oily stains in some k5's sensors. while some dealers are swapping the defective cameras, we yet have to hear pentax address this offcially.
let's hope this doesn't go the way of the SDM where pentax just kept quiet.
both cameras have their pro's and con's.
bottom line is look for the features and lenses that you need most and pick the brand/model that matches most closely to your needs.
if you believe that you must have the 150k shutter, go with nikon.
if you need in-body SR, go with pentax
also look for the over-all support of the product, as a whole system.
unfortunately, there's no model DK7500