The TIE Agressor, developed c. 1 ABY, was more expensive than other TIEs, so it saw limited use outside the experiment phase. It carried a laser cannon and a missile launcher with a 6 concussion missile magazine. It also carried a gunner, unlike most other TIE variants which had a pilot in both roles.
About this creation
Profile view (my favorite).
Starboard view. This model was big enough to allow wing detail.
Aft view, showing the twin ion engines.
For reference shots, click here .
Main source: Wookieepedia
Article: TIE Agressor
(sorry for lack of HTML, I stink at it).