There are currently 9 Battlestars serving the fleet. The Battlestars are the Pacifica, Pegasus, Athenia, Excelsia, Spartica, Titania, Olympia, Attica and the new Athenia.
Only one battlestar, the Prometheus, has been lost since the Holocaust.
There are only 4 Gunstars built and currently serving the fleet. Others are planned, but production of these vessels isn't going as fast as the planners expected.
The Gunstar may become an obsolete vessel though. Serious flaws have been found in the weapons to helm time and the power output of the vessel isn't sufficient enough to hold the shields up for lengthy periods. The cost of each vessel has been reaching Battlestar proportions, and thus, why spend the money on a Gunstar when you can have a Battlestar...
The Cobra is the epitome of the various alien races and humans working together to achieve a common goal. The Cobra utilizes new computers built by the Hanshaks, new shielding technology built by the Delphians, and smaller, modular designing created by the Hisari, and the new Adamantium armor was created by human engineers.
The entire ship is full of innovative weaponry, shielding, armor and computer systems. In its early tests, the Cobra has outpaced the speed and agility of Battlestars, Gunstars, and even Vipers. The weaponry onboard the Cobra allows it to take on a fleet of Cylon raiders, along with the Basestar, without serious damage to the ship.
Only the prototype, Cobra, has been built so far, but Colonial fleet officials has recently ordered the production of 30 of these vessels over the next 10 yahren.