HMS Imperator, from the Honor Harrington series of books. Basically, it served as the flagship for the main character, and, along with a very few other ships in Eighth Fleet, it was the most advanced ship in existence, one of the lead ships of the Invictus Class of Superdreadnoughts, able to roll effectively unlimited (not really unlimited, but enough that most battles would be over before it ran out. Pod Battlecruisers did have to worry about ammunition, however) Multi Drive Missle (MDM) Pods. That's fairly standard, however. More important, they, can roll Apollo Missile Pods. Without going into the specifics, a single SD(P) (Super Dreadnought (pod)) armed with Apollo could destroy a force a good deal it's size with negligible damage because it can feed its missiles telemetry fire-control data effectively real-time. It's only when you read the entire series (this is deployed in the 11th book) that you realize how massive an advantage real time missile telemetry gives you.
TL;DR, assuming I could be resupplied and didn't let myself be blinded by overconfidence, I would be invincible in this ship.
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