What would be your choice in the current crop of systems? I blow hot and cold with my Pentax K20d - I do love my 77ltd prime, and have done some great shots with the other handful of lenses I have for it. But my recent acquisition of my DLux4 has me wanting a bit more from the dSLR end of things. I am totally impressed with the DL4 in low light and they colors.
I have my biases - I tend to shoot a lot of low light situations, avoid flash like the plague, am more on the art side of things, and often will shoot fairly auto (program mode where i can do quick tweaks). I can get a lot of what I "see" with the DL4, but sometimes I want really crisp, high contrast, good dynamic range stuff, often in low light.
I know that many here have multiple systems. I briefly tried an M8 but didn't really "get" the rangefinder thing. I could reconsider that, but given my desires for great low light performance a D700 might be the ticket along with a few good primes. The 5D Mk2 is interesting especially with the video capability as I do shoot video as well, usually with a Canon XH-A1. But my gut feeling is that the video implementation is somewhat klunky...kind of forcing the beast to do something it wasn't really made for.
Or just buy a new ltd prime for the Pentax and focus more on tweaking the shot when I'm taking it instead of just snapping away and dealing with it in post. I'm just trying to stimulate the economy