Is there a way to get a modal display when ⌘-⌥-→ and ⌘-⌥-←?
Witch can do this, but its development has been a bit stale (I don't know if it still works).

Window switching is fast and fun
With Witch installed, a pop-up panel shows all open windows—even windows in other Spaces, if you're running 10.6. From the panel, simply select the window you'd like to activate. There is no step two!