Nikon is definitely a brand that came to mind, but during the video mode for the D90's, which I would be using a lot of, has a lot of rolling shutter, which is the jelly wobbling effect. I know that most DSLR's have some sort of rolling shutter in video, major or minor, but for some Nikon camera's it can get pretty bad. The GH1 has a minimal jelly effect. But im not all concerned about video. But anyway, the GH1 can take some other lenses like the Nikkor, with either a adapter with it or it can just fit right on.
The 3 brands im thinking about as of now are Nikon, Canon and Lumix. Im just keeping an open mind till around December time.