Keep shooting with the 60D and 400 f/5.6L. Maybe buy a used 7D and put the $2K-used7D$ in the bank, and start adding to it for The Big White, or take a trip. I am looking for a big improvement over the 60D, something with improved sensor as well as improved AF relative to 60D. I have GAS but I have to confess that I love my 4 year old 60D. If I do get a new APS-C, I might consider converting the 60D to "60Da" eventually.
New photo equipment won't make me a better photographer without a lot of other effort added. Getting out and shooting, and then critically examining the results , is more important. I am working on improving fitness, camping and winter camping skills, and perhaps renting a big white this fall to practice on the fall migration, with the goal eventually to go to the "spring" crane migration in Nebraska. "Spring" in quotes, because if you rent a blind, you have to go in during mid-day, and stay until the next mid-day, without heat, without stove, and they recommend that you have experience in winter camping in below 0F temperatures. I am a summer/fall camper, accustomed to temperature lows of 45 to 50F. I added a 15F bag to my gear, to supplement the 50F bag, bag liner, heavy duty space blanket, and Z foam sleeping pad that has been my system. Also added the sinfully cozy Big Agnes Q-core insulated inflatable sleeping pad - the thing is a brick to carry, but at the end of the day you are sleeping on 3 to 4 inches of toasty air, good for fall camping as well.