ECLIPSE-CLASS SUPER DESTROYER:
http://img831.imageshack.us/img831/8089/angelofdeathu.png
It isn't named the Angel of Death for nothing. It is equipped with enough firepower for orbital bombardments and much, much more. Aswell as boasting superior weaponry to any known ship, it has highly advanced powerful engines that are capable of taking it at it's maximum speed of 743 MPH and 100 Infantry Squadrons and 50 Starship Squadrons. (Each Infantry squadron holding a thousand men, and each starship squadron holding 65 ships.)
(YES, I KNOW IT IS THE EXECUTOR FROM STAR WARS. However, I modified by making it longer and having a higher command tower and some more engines.)