Originally posted by RiceHigh 6MP is just too little by today's minimum standard, frankly - even most P&S DCs start from 10MP. In fact, the resolution difference can be clearly seen on a full screen (not full sized) picture displayed on a 19" monitor or larger. Furthermore, with such a low resolution, the user will have no room for further cropping.
Some of the best sports shots I've taken are on an old 1D I was given (well, "loaned"). It's got the flat Canon color -- but AF is obviously super snappy, fast burst rate -- a great camera for photojournalism.
It's ~4 MP, but I couldn't care less -- the chunk of glass that sits in front of the sensor is far more important.
A 6 MP sensor is, in my opinion, about perfect. You get gorgeous 300 DPI 8x10 prints -- if you ever need to go bigger, your DPI goes down, but unless you're hitting under 200 DPI, I doubt you'd be able to see a difference.
And, as mentioned, a 6 MP sensor has some big-ass photosites, which collect more light. What ever happened to ISO3200 when I sold my *ist DS and bought the brand new shiny K10D? Photosites shrunk, image quality went down.
Get a K100D Super (which supports SDM lenses). It's super small, very inexpensive, and, in my opinion, a GREAT camera to start out with -- and it will allow you to take full advantage of the latest, greatest lenses from Pentax.