I like a scope on my FAL. Optics eliminate the wobble between the receivers and the wobble of the rear sight, that is such an issue with the FAL.
With my scoped FAL, we shoot clay pigeons, at 500 yards, my buddy running a string of 8 in a row, not too bad for an "inaccurate" rifle platform.
A scope will help in long range target recognition and detection, and with the DSA scope mount, I think that the FAL is the one of the easiest MBRs to mount optics on.
Check out the Burris Fullfield II scopes. Good quality, for under $200. I like them, though I am disappointed that their Balistic Plex, is set up to only be accurate at 9 power, this makes it less usable for field use, IMHO.