I just read your posts. Can't imagine why you ruled out the Pentax. I've got a previous generation K100D, and it is just fantastic. By all accounts, it has the best kit lens made, and it has body-integral anti-shake. (this was a huge feature for me)
Pentax optics are fantastic. Pentax co-developed their lens multi-coating with Carl Zeiss; Pentax calls it SMC and Zeiss calls it T*.
If you're looking to leave room for growth, do not get one without interchangable lenses. It isn't just the option of interchangeable lenses you're buying, it is a bigger sensor sharper enlargements too.