If you can wait and put the money together looking at the 5D mklll would settle all your camera needs for many years. Cameras will continue to get better, and prices for the high end gear is likely to hover around the same costs for years as well. Jumping from Nikon to Canon is simply a matter of changing names, most of the gear is similar. If you can sell off the Nikon stuff and make a few bucks to put towards the change then it will help. I considered a switch from Canon to Nikon a couple of years ago, but for me it was a $25,000 switch, and that just wasn't realistic.
Check out the Canon gear, if you can rent the bodies and use them for a day, see how they feel, it may not feel right. If it doesn't feel comfortable right away, it will never be comfortable. Find what works for you, don't over read or over think your decision, it will drive you nuts, to the point of second guessing yourself later.