I always felt that left hand ctrl+tab is an awkward position for the fingers. I prefer Ctrl + PageUp/PageDown to switch, and like Chromes Shift + Ctrl + PageUp/Down to move tabs.
I don't know about you, but my Tab is on one side of the keyboard and the PageUp/Down are on the other. Pressing this keys would require me to have both hands on the keyboard, which, after I uninstalled Vimperator, I don't have anymore.