I mainly shoot with a Leica M6 and 28/35/50. However, I must acquire a DSLR for my photojournalism class. Prior to Leica I have used old school Pentax and Nikon, but I don't have any on each anymore. I'm leaning toward the Canon 7d or Nikon D300s. I recently noticed from shopping and testing that Nikon lens turn the opposite direction from Leica which was initially confusing. Coming from Leica, I can only foresee myself making use of aperture and shutter speed so all the technology is a bit confusing. I expect a learning curve for which ever system I choose, but other than that, can any guide me toward a direction in which system to start off on from Leica?