Out of interest, I'm currently scraping money together to get an Amarr battleship, but with three available I'm spoiled for choice!
The Armageddon is the smallest and cheapest. Only 7 turrets, with 10% to cap and 5% rate of fire.
The Apocalypse is the middle one, 10% to cap, 7.5% to optimal range.
The Abaddon is the most expensive and toughest, 5% to damage and resists.
I don't think I'll get the armageddon, lowest cap, even with the cap bonuses to the turrets, the extra low slot is nice in exchange for a mid, and its got double the drone bay size, but I have a habit of forgetting drones are there until they've been shot to pieces anyway.
The Apoc is nice, but I'm not sure if its worth it compared with the abaddon. Similar caps, but with the resist bonuses, I'd be able to tank far more damage with an abaddon meaning I won't need repairers running as much, making up for the lack of cap bonus, and a damage bonus is better than the optimal range bonus, IMO.
Or am I talking silly here? Any views?