Tough to go wrong with any of those brands. For an interchangeable lens camera, I suggest going with mirrorless instead of a traditional DSLR. The autofocus on the newer bodies is just amazing.
Have a look at this:
DP Review cameras under $1500.
A key thing to remember is that it’s really the lens that makes the difference. And knowing how to use it, of course.
I would also suggest renting some different cameras before buying. Gives you a chance to hold them in your hand and see if it’s comfortable.