Some of those lenses won't work. I'd also recommend the 6D, the quality is fantastic. I switched from a 6D to a 5DmkIII (purely due to docus points) and then to a 5Ds (too much money to burn).

The 6D is great for landscapes and great in low light (shot a few gigs with it and it didn't miss a beat), but it's focus point selection is incredibly primitive both in types of focus points and actual focus points available. The 5dmkIII is far superior in that regard. However, the 6D is still a fantastic camera and the image quality is amazing.