Help me choose another camera

my recommendation on a 2nd body is to usually start with something that's as similar as possible.
I like as many of the controls to match on both bodies as much as possible. Same with batteries - I'd prefer to carry more of 1 type of battery than 2 different types. Same with memory, I don't want to deal with CF in one body, and SD in another.
If something happens and you have to go from 1 body to another, all these little things will make it seamless

Maybe ill try my 5d and a 7d combo and if i dont like it i can easily sell it for another 5d or 5d mkII