Pentax cameras are pretty decent and it's easier to get lenses as compared to before where the 2 big camps dominate the market.
I would suggest that you get a K10D which gives you more and it's really worth.
In the film days, a 50mm lens is consider a standard lens. Anything below that is consider a wide angle lens and anything above is consider a tele lens. Anyway, just get a kit lens and you would be ready to go and get some decent pictures.