Total Commander

The order is that of Alt+Tab, so you can press Ctrl+Tab and switch between only two tabs.

Good thought.
Just to make sure, you know about ctrl-1; ctrl-2; etc for tabs (you have to define them first)?
And Ctrl-shift-tab.

I knew about Ctrl+Shift+Tab (I use it a lot).
Didn't knew about Ctrl+1, Ctrl+2... but I don't find them that usefull unless you have a set of locked tabs (which I don't, one of my friends has).