The eternal body/lens question
It's eternal because every person has a different reason to shoot, different needs and budget - so the answers may not suit the questioner but we keep trying..
I went with K-7 and 16-45, a most excellent performer but not WR. I've an 18-55WR on order and have the 50-200WR which I like a lot. Either of those zooms plus the manual-focus prime(s) as suggested above will serve you well. I have a Rikenon 50/1.7 and a Chinon 28/2.8 that serve me well, both cost very little.
As to m4/3: I have a Pana G1, the flip screen is handy & discreet. No IS inside though, and if you dislike electro-VF then never mind! Far better than any P&S but not as feature-filled as the K-7.
Jim in Oregon.. granitix.blogspot.. A200 veteran, now K-7 + G1