I have had an Airbus A320 for FS2002, by PSS. but it was simplified and some minor bugs there were, too. Didn't use it often, since superior packages were available, with other planes.
If you want a "realistic" complex cockpit environment, try the
PMDG 747
http://www.avsim.com/pages/0805/pmdg...47_review.html
or the Level-D 767
http://www.avsim.com/pages/0505/lvld_767/lds767.html
or the Flight-1 ATR-72-500.
(cannot be linked, find the reviews yourself in the Avsim review archive, under A (ATR...)
All of them have been redone and released as dedicated FSX packages, too. the FS9-versions all won maximum points and maximum scores around the comnunity's websites.
For small though complex planes , watch out for the Piper Cheyenne by Digital Integration.