Might drop by the Nikon & Pentex forums also.
I went with the D5000 for several reasons.
1. Nikon reputation
2. Nikon glass
3. Friend has an older D70 and loves it.
Had mine almost a month, LOVE IT!
--
Hi
I have a K-x and in Nikon a D50.
I would not get a D5000 (or any Nikon without a af motor) as I can not use my three older screwdrive af Nikkors on it.
If that means nothing to you, make your choice on the ergonomics as that is very personal...I much prefer Pentax ergonomics to Nikon...my D50 feels like a brick to me....go with the one that feels best to YOU if they are close for you.
I prefer the Pentax because I like using all my lenses stabilized, including short fast primes and that is not available with Nikon, the K-x can also use stabilized lenses if you prefer in lens...NINE available from Sigma at the moment.
Regards stabilization , I will hopeully soon be able to do a test between the Vr and the K-x in camera with the SAME lens...I have a Nikon VR kit lens on its way to me ...should be fun comparing....it is enough to know that both ways work and work well but differently ffor different people...I get the same sort of speeds in camera as in lens users get. but much cheaper....even a BROKEN VR kit lens was over $100 to get to me and it climbs steeply from there...even old and very cheap lenses are stabilized for the Pentax.
The K-x is also a little better at high iso (from reviews)...Dxomark has the D5000 SENSOR a little better at high iso, but reviews of the CAMERA have it the otherway)....use Dxomark as an interesting guide only...even cameras with the same sensor score differently.
They both have the same dynamic range but the K-x has a little better colour depth.
They both have there for and against...the K-x is a lttle louder shutter wise and the af point does not show in the viewfinder....but I know where it is anyway as ther are guide brackets....even if using a other than the centre point and can use focus and recompose anyway if I choose...the camera is not THAT loud either.
The Kx viewfinder is brighter than the D5000 with as much information, it shoots at a faster frame rate and the af is quite good....the d5000 would track better but the af speed is very much lens dependant....my slowest combination regards af speed is the D50 and a Nikon 70-300 lens, my fastest the K-x with some short lenses and auto focus adapter. The D5000 has a tilt/swivel lcd.
For ME, the great stabilization with all my lenses and being able to use all my lenses (even my Nikon ones bare...do this at your own risk) and the best high iso available means no contest.
For YOU, go play with them...maybe play with some others as well...get the one that is right for YOU....good luck.
neil
http://www.flickr.com/photos/26884588@N00/