Diameter: 160 kilometers
Armament
1 Superlaser
5,000 Turbolaser Batteries
5,000 Heavy Turbolasers
2,500 Laser Cannons
2,500 Ion Cannons
768 Tractor Beam Emplacements
Crew: 265,675
including
57,276 Gunners
Troop Capacity: 607,360
including
25,984 Stormtroopers
42,782 Starship Support Staff
Total Population: In excess of one million
Taken from a Star Wars magazine, this is the figure that includes any non-military staff, such as cooks, cleaners, people who empty out garbage compactors and the valets who park TIE Fighters.
Fighter Complement:
1831 TIE Fighters
2904 TIE Assault Craft
806 TIE Boarding Craft
1384 Scouts (Whatever these are)
Warship Complement:
6 Star Destroyers
10 Battleships
39 Heavy Cruisers
17 Light Cruisers
81 Fighter Tenders
190 Troop Transports
714 Corvettes
509 Tanker Drones
Defenses:
Reinforced hull plating
Multiple overlapping shield generators
Sensor jammers
"Countermeasures"
(Either all this wasn't working well at Yavin or they were pretty poorly designed)
Cost: You have to be kidding
Taken from http://www.theforce.net/swtc/ds.html though if anyone has any more accurate figures then /msg me and I'll put them here.