Quote
mousewheel > all =) for me anyway
But you have to check everytime for what weapon you are selecting, and mouse wheel is not precise. And even if you learn the weapon sequence, what if you drop a weapon and pick up another one? You can't be sure of what you'll get in your hands unless you check, and moving your focus away from the action can result in getting yourself killed.
Really, after I get used to this layout my mind no longer has to take an active role in weapon switching, so I can just concentrate on aiming at your head =)