I had a K20 until a few hours ago. After several weeks of advertising it, the body finally sold. I still own two lenses and a flash so I'm still set on Pentax. I don't see anything in the other brands that I particularly like anyway. So, this week when I get a moment I'll head to the local camera store and pick up a K-5. I'm expecting to pay$1,300.
I know that in a couple of years the boost to Pentax from the Ricoh acquisition will result in some interesting and temping new products but I'm not going to wait that long. Besides, it looks like most improves will be in the movie side of things for the next little while. So for me, the best time to move up to a K-5 is tomorrow!