If you can find a Model 12 with a cutts comp tube/w chokes -- get it.
NOTHING is faster than a pump shotgun... not even automatics.
http://www.youtube.com/watch?v=7tD-t80nkgU
(The Low House/Doubles is far faster -- near instantaneous.)
But if you
must have a left-handed -- and if not a Model 12 -- then consider either an Ithaca 37
http://www.ithacagun.com/trap_gun.html
or a Browning BPS
http://www.browning.com/products/cat...2&tid=241&bg=x
Both are bottom eject so left/right doesn't matter